{"id":1538,"date":"2025-05-05T16:08:09","date_gmt":"2025-05-05T16:08:09","guid":{"rendered":"https:\/\/certpanelresources.flywheelsites.com\/?page_id=1538"},"modified":"2025-06-23T12:26:55","modified_gmt":"2025-06-23T12:26:55","slug":"what-is-the-drown-attack-how-to-patch-the-cve-2016-0800-exploit","status":"publish","type":"page","link":"https:\/\/certpanel.com\/resources\/what-is-the-drown-attack-how-to-patch-the-cve-2016-0800-exploit\/","title":{"rendered":"What Is the DROWN Attack? How to Patch the CVE-2016-0800 Exploit"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>What Is the SSL DROWN Attack Vulnerability?<\/strong>&nbsp;<\/h2>\n\n\n\n<p>The <strong>DROWN attack<\/strong>, or <strong>Decrypting RSA with Obsolete and Weakened Encryption<\/strong>, is an SSL\/TLS vulnerability that allows attackers to decrypt encrypted traffic. It targets servers that still support the outdated <strong>SSL 2.0 (SSLv2) protocol<\/strong> and share cryptographic keys between SSLv2 and modern TLS services.&nbsp;&nbsp;<\/p>\n\n\n\n<p>This flaw, which is tracked as <a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2016-0800\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>CVE-2016-0800<\/strong><\/a>, can lead to the exposure of sensitive data, such as your customers\u2019 passwords, personal data, credit card information, and emails.&nbsp;<\/p>\n\n\n\n<p>Despite <a href=\"https:\/\/isc.sans.edu\/diary\/29908\" target=\"_blank\" rel=\"noreferrer noopener\">SSLv2 being deprecated for years<\/a>, there are still many servers that remain vulnerable due to legacy support or shared certificates across services.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"http:\/\/certpanelresources.flywheelsites.com\/wp-content\/uploads\/image-29-1024x550.jpeg\" alt=\"\" class=\"wp-image-1540\"\/><figcaption class=\"wp-element-caption\">Image caption: The SSL_ERROR_UNSUPPORTED_VERSION error message indicates that there is an issue with a protocol that&#8217;s no longer supported.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>DROWN Attack Impacts: Understanding the CVE-2016-0800 Exploit&nbsp;<\/strong><\/h2>\n\n\n\n<p><strong>CVE-2016-0800<\/strong> is the public identifier for the SSL DROWN attack vulnerability. Remote attackers can <strong>decrypt modern TLS traffic<\/strong> by leveraging weaknesses in SSLv2. In some configurations, decryption takes under a minute.&nbsp;<\/p>\n\n\n\n<p>A system is vulnerable to DROWN if it:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>supports the SSL version 2.0 protocol<\/strong>, directly or indirectly.&nbsp;<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>shares RSA private keys<\/strong> across SSLv2 and TLS protocols.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>An attacker exploits this setup by making SSLv2 connections to extract key information, which is then used to decrypt TLS-encrypted traffic on the same server. This applies to web servers, email servers, VPNs, and more. It affects services and servers using HTTPS, SMTPS, IMAPS, POP3S, or any SSL\/TLS-secured protocol.&nbsp;&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Is DROWN Still Considered Dangerous?&nbsp;<\/strong><\/h2>\n\n\n\n<p>Although the number of insecure servers has gone down since DROWN was originally found when millions of servers were vulnerable, these flaws remain dangerous to any systems that are not properly secured.&nbsp;(Hint: Don&#8217;t be one of them.)<\/p>\n\n\n\n<p>To be a victim of the DROWN attack today is to have <strong>sensitive data<\/strong> like passwords, finical data, and emails at risk of being stolen or leaked. In addition to the direct threat of data breaches, organizations subsequently must contend with <strong>compliance breaches, reputational damage, and loss of customer trust.<\/strong>&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Exposure:<\/strong> Millions of servers were found vulnerable at the time of discovery. Thankfully, it\u2019s a smaller risk today due to most servers supporting SSL 1.2 as a minimum. &nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>Fast Attack Time:<\/strong> Data decryption for impacted systems can occur rapidly using optimized techniques.&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>Data Breach Risk:<\/strong> Credentials, financial data, and emails can all be exposed.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><strong>How to Check Whether Your Site Is Vulnerable to the DROWN Attack<\/strong>&nbsp;<\/strong>&nbsp;<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Option 1: Use OpenSSL Commands to Test for SSLv2 (Legacy Systems)<\/strong><strong>&nbsp;<\/strong>&nbsp;<\/h3>\n\n\n\n<p>If you\u2019re using and older version of OpenSSL (e.g., OpenSSL 0.9.8), you can test for SSLv2 support on your server using the following command:&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl s_client -connect yourdomain.com:443 \u2013ssl2&nbsp;<\/code><\/pre>\n\n\n\n<p>If you\u2019re looking for just a quick check and don\u2019t need as much info, use this command: &nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>openssl s_client -ssl2 -brief -connect yourdomain.com:443<\/code><\/pre>\n\n\n\n<p>If you see an output like \u201c<strong>write:errno=104\u201d<\/strong>, it means SSLv2 is off and your server IS NOT vulnerable to the DROWN attack.&nbsp;&nbsp;<\/p>\n\n\n\n<p>In the event of a successful connection, the server is compromised and SSLv2 needs to be disabled at once.&nbsp;<\/p>\n\n\n\n<p><strong>Note:<\/strong> Later versions of OpenSSL (like OpenSSL 3.x) have removed support for the SSLv2 protocol version check entirely and will give an \u201cUnknown option: -ssl2\u201d error. (The same is true for checking protocol versions SSLv3 and TLS1_0.)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Option 2: Use <\/strong><a href=\"https:\/\/certpanel.com\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>CertPanel SSL Monitor<\/strong><\/a><strong> (Recommended)<\/strong>&nbsp;<\/h3>\n\n\n\n<p><strong>Rather than relying on legacy systems, step into the modern age with CertPanel SSL Monitor. <\/strong>&nbsp;<\/p>\n\n\n\n<p>This real-time monitoring tool is ideal for continuous SSL hygiene checks:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Real-time alerts<\/strong> when outdated protocols are re-enabled.&nbsp;<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Change tracking<\/strong> on cipher suites and protocol updates.&nbsp;<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Actionable reports<\/strong> showing what needs fixing.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>&nbsp;Use CertPanel SSL Monitor to check your domain for any SSLv2 and DROWN attack-related issues:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Add Your Domain<\/strong>:&nbsp;\n<ul class=\"wp-block-list\">\n<li>Login to your <a href=\"https:\/\/certpanel.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">CertPanel account<\/a>, go to the SSL Monitor feature, input your domain, and click <strong><em>Scan<\/em><\/strong>.&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"220\" src=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-28-1024x675-1-e1750449902303.jpeg\" alt=\"\" class=\"wp-image-1723\" srcset=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-28-1024x675-1-e1750449902303.jpeg 1024w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-28-1024x675-1-e1750449902303-300x64.jpeg 300w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-28-1024x675-1-e1750449902303-768x165.jpeg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ol start=\"2\" id=\"block-c4ff2e78-2e43-4ef2-920a-f9f7388ee34f\" class=\"wp-block-list\">\n<li><strong>Analyze Results<\/strong>:\n<ul class=\"wp-block-list\">\n<li>CertPanel generates a detailed report of your SSL\/TLS configurations, including any outdated protocols like SSLv2. It also provides remediation steps to fix the <strong>DROWN<\/strong> vulnerability:&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"926\" height=\"1019\" src=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-33.jpeg\" alt=\"\" class=\"wp-image-1544\" srcset=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-33.jpeg 926w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-33-273x300.jpeg 273w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-33-768x845.jpeg 768w\" sizes=\"auto, (max-width: 926px) 100vw, 926px\" \/><\/figure>\n\n\n\n<ol start=\"3\" id=\"block-ca4603fc-1d42-49a4-9fbc-5b966148f4de\" class=\"wp-block-list\">\n<li><strong>Set Alerts<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Enable alerts for outdated protocols or configuration changes to proactively address vulnerabilities.&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1015\" height=\"348\" src=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-30-1024x400-1.jpeg\" alt=\"\" class=\"wp-image-1724\" srcset=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-30-1024x400-1.jpeg 1015w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-30-1024x400-1-300x103.jpeg 300w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-30-1024x400-1-768x263.jpeg 768w\" sizes=\"auto, (max-width: 1015px) 100vw, 1015px\" \/><\/figure>\n\n\n\n<p>Here&#8217;s a quick peek at how you can use both of these methods:<\/p>\n\n\n\n<div>\n  <script async src=\"https:\/\/js.storylane.io\/js\/v2\/storylane.js\"><\/script>\n  <div class=\"sl-embed\" style=\"position:relative;padding-bottom:calc(56.25% + 25px);width:100%;height:0;transform:scale(1)\">\n    <iframe loading=\"lazy\" class=\"sl-demo\" src=\"https:\/\/app.storylane.io\/demo\/xefcfasr0pqj?embed=inline\" name=\"sl-embed\" allow=\"fullscreen\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%!important;height:100%!important;border:1px solid rgba(63,95,172,0.35);box-shadow: 0px 0px 18px rgba(26, 19, 72, 0.15);border-radius:10px;box-sizing:border-box;\"><\/iframe>\n  <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the SSLv2 DROWN Vulnerability in Windows II, NGINX, and Apache&nbsp;<\/h2>\n\n\n\n<p>To protect your servers from DROWN attacks, do the following steps for various server environments:&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Windows Server (IIS)&nbsp;<\/h3>\n\n\n\n<p>To secure your IIS server from DROWN attacks:&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Download and install IIS Crypto from <a href=\"https:\/\/www.nartac.com\/Products\/IISCrypto\" target=\"_blank\" rel=\"noreferrer noopener\">Nartac Software<\/a>.&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>Open IIS Crypto and select your server.&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>Look under <strong>Protocols<\/strong>, deselect <strong>SSL 2.0<\/strong>, and ensure TLS 1.2 is checked. (You can also turn on TLS 1.3, if your environment supports it.)&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li>Configure your cipher suites:&nbsp;\n<ul class=\"wp-block-list\">\n<li>In IIS Crypto Ciphers, deselect all weak ciphers (e.g., RC4), and select only strong ciphers that are compatible with TLS 1.2 or higher.&nbsp;<\/li>\n\n\n\n<li>Depending on your needs, configure FIPS-compliant ciphers (to meet certain standards).&nbsp;<\/li>\n\n\n\n<li>Click <strong>Apply<\/strong> to apply the changes and reboot the server.&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>Here\u2019s a quick peek at how this looks:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"506\" src=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/drown-attack-fix-windows-iis.png\" alt=\"A look at how to fix the SSLv2 DROWN vulnerability on Windows IIS Server\" class=\"wp-image-1852\" srcset=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/drown-attack-fix-windows-iis.png 900w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/drown-attack-fix-windows-iis-300x169.png 300w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/drown-attack-fix-windows-iis-768x432.png 768w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<p>Restart IIS by entering the following command in a command prompt or PowerShell window:&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>iisreset&nbsp;<\/code><\/pre>\n\n\n\n<p>Watch the animated walkthrough for fixing the DROWN vulnerability in a Windows IIS Server environment:<\/p>\n\n\n\n\n\n<div>\n  <script async src=\"https:\/\/js.storylane.io\/js\/v2\/storylane.js\"><\/script>\n  <div class=\"sl-embed\" style=\"position:relative;padding-bottom:calc(56.25% + 25px);width:100%;height:0;transform:scale(1)\">\n    <iframe loading=\"lazy\" class=\"sl-demo\" src=\"https:\/\/app.storylane.io\/demo\/cd8bj6qxeaob?embed=inline\" name=\"sl-embed\" allow=\"fullscreen\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%!important;height:100%!important;border:1px solid rgba(63,95,172,0.35);box-shadow: 0px 0px 18px rgba(26, 19, 72, 0.15);border-radius:10px;box-sizing:border-box;\"><\/iframe>\n  <\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. NGINX<\/strong>&nbsp;<\/h3>\n\n\n\n<p>To protect your NGINX server against the DROWN attack:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Edit Your NGINX Configuration File<\/strong><\/h4>\n\n\n\n<p>The exact location of the NGINX configuration file can vary depending on the Linux distribution you are using. For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ubuntu\/Debian<\/strong>:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vim \/etc\/nginx\/sites-available\/default\nsudo vim \/etc\/nginx\/nginx.conf<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CentOS\/RHEL\/Alma Linux\/Rocky<\/strong>:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vim \/etc\/nginx\/conf.d\/default.conf\nsudo vim \/etc\/nginx\/nginx.conf<\/code><\/pre>\n\n\n\n<p><strong>Our example here focuses on Ubuntu\/Debian-based systems.<\/strong><\/p>\n\n\n\n<p>Open the configuration file with:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vim \/etc\/nginx\/sites-available\/default<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Configure Strong Protocols and Ciphers<\/strong><\/h4>\n\n\n\n<p>Add or modify the following lines inside the server block to disable weak protocols and cipher suites, and enforce secure TLS configurations:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong># Disable SSLv2 and SSLv3, only allow TLSv1.2 and TLSv1.3&nbsp;&nbsp;<\/strong>\nssl_protocols TLSv1.2 TLSv1.3;&nbsp;&nbsp;\n\n<strong># Specify strong, modern cipher suites&nbsp;<\/strong>\nssl_ciphers 'TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256';&nbsp;&nbsp;&nbsp;\n\n<strong># Enable Perfect Forward Secrecy (PFS) by using strong key exchange algorithms&nbsp;<\/strong>\nssl_prefer_server_ciphers on;<\/code><\/pre>\n\n\n\n<p><strong>Important Note:<\/strong> NGINX <strong>does not support SSLv2<\/strong>. Therefore, <strong>it\u2019s not directly vulnerable to the DROWN attack<\/strong>. By explicitly configuring your server to use only modern TLS protocols, you help secure it against vulnerabilities related to outdated SSL\/TLS protocol versions.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"872\" height=\"490\" src=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-nginx.png\" alt=\"A screenshot of NGINX that shows the elements required to disable SSlv2 on the server\" class=\"wp-image-1853\" srcset=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-nginx.png 872w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-nginx-300x169.png 300w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-nginx-768x432.png 768w\" sizes=\"auto, (max-width: 872px) 100vw, 872px\" \/><\/figure>\n\n\n\n<p>After making these changes, restart NGINX to apply the configuration:&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># sudo systemctl restart nginx&nbsp;<\/code><\/pre>\n\n\n\n<p>Want to see how all of this comes together? Walk through the process with our demo:<\/p>\n\n\n\n<div>\n  <script async src=\"https:\/\/js.storylane.io\/js\/v2\/storylane.js\"><\/script>\n  <div class=\"sl-embed\" style=\"position:relative;padding-bottom:calc(56.25% + 25px);width:100%;height:0;transform:scale(1)\">\n    <iframe loading=\"lazy\" class=\"sl-demo\" src=\"https:\/\/app.storylane.io\/demo\/ysok2m0bjtuk?embed=inline\" name=\"sl-embed\" allow=\"fullscreen\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%!important;height:100%!important;border:1px solid rgba(63,95,172,0.35);box-shadow: 0px 0px 18px rgba(26, 19, 72, 0.15);border-radius:10px;box-sizing:border-box;\"><\/iframe>\n  <\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Apache<\/strong>&nbsp;<\/h3>\n\n\n\n<p>To protect your Apache server from the DROWN attack:&nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Edit Your Apache SSL Configuration File<\/h4>\n\n\n\n<p>Start by locating and editing your Apache SSL configuration file. The file path may differ based on your Linux distribution. For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ubuntu\/Debian<\/strong>:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vim \/etc\/apache2\/sites-available\/default-ssl.conf<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CentOS\/RHEL:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo vim \/etc\/httpd\/conf.d\/ssl.conf<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>Disable SSLv2, SSLv3, and Weak Cipher Suites<\/strong><\/h5>\n\n\n\n<p>Add or modify the following lines to disable weak protocols and specify secure cipher suites:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong># Disable SSLv2 and SSLv3 to protect against DROWN attacks and other vulnerabilities<\/strong>\n   SSLProtocol -all +TLSv1.2\n\n<strong># Specify secure cipher suites to avoid including weak ciphers like RC4 and MD5<\/strong>\n    SSLCipherSuite HIGH:!aNULL:!MD5:!RC4\n\n<strong># Enable strong ciphers and make sure only secure options are used<\/strong>\n    SSLHonorCipherOrder on<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"715\" src=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-apache-1024x715.jpg\" alt=\"A screenshot of an Apache server showing the elements required to disable SSlv2\" class=\"wp-image-1854\" srcset=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-apache-1024x715.jpg 1024w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-apache-300x210.jpg 300w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-apache-768x537.jpg 768w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/disable-sslv2-weak-protocols-apache.jpg 1251w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<p>Our example uses the <strong>Ubuntu\/Debian<\/strong> distribution. File paths and configuration structure may vary slightly depending on your operating system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Restart Your Server<\/strong><\/h3>\n\n\n\n<p>After making these changes, restart Apache to apply the new configuration.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>For Modern Distros<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ubuntu\/Debian:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl restart apache2<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CentOS\/RHEL:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl restart httpd<\/code><\/pre>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>For Older Distros<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ubuntu or Debian:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo service apache2 restart<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CentOS\/RHEL:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo service httpd restart<\/code><\/pre>\n\n\n\n<p>Ready to see how everything comes together? Walk through the process now:<\/p>\n\n\n\n<div>\n  <script async src=\"https:\/\/js.storylane.io\/js\/v2\/storylane.js\"><\/script>\n  <div class=\"sl-embed\" style=\"position:relative;padding-bottom:calc(56.25% + 25px);width:100%;height:0;transform:scale(1)\">\n    <iframe loading=\"lazy\" class=\"sl-demo\" src=\"https:\/\/app.storylane.io\/demo\/hp1y2wjh6e1d?embed=inline\" name=\"sl-embed\" allow=\"fullscreen\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%!important;height:100%!important;border:1px solid rgba(63,95,172,0.35);box-shadow: 0px 0px 18px rgba(26, 19, 72, 0.15);border-radius:10px;box-sizing:border-box;\"><\/iframe>\n  <\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Verify Configuration<\/strong>&nbsp;<\/h3>\n\n\n\n<p>Your final task is to check whether SSLv2 (and, ideally, all insecure protocol versions) are disabled, and that your server is using strong cipher suites:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use an external<strong> SSL\/TLS testing tool<\/strong> like <strong>OpenSSL <\/strong>to confirm that SSLv2 and other weak protocols are disabled, and only secure protocols and ciphers are in use.<\/li>\n\n\n\n<li>Then use <strong>CertPanel SSL Monitor<\/strong> to continuously track SSL\/TLS changes and receive proactive alerts for any misconfiguration or regression.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Key Takeaways to Avoid DROWN Attacks&nbsp;<\/strong><\/h2>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Disable all legacy protocols:<\/strong> Make sure that SSLv2 is disabled on all servers, as the primary DROWN attack is exploits it.&nbsp;<\/li>\n\n\n\n<li><strong><strong>Use <\/strong><a href=\"https:\/\/certpanel.com\/ssl-monitor\"><strong>CertPanel SSL Monitor<\/strong><\/a><strong> to keep an eye on your domain and server configurations<\/strong>. <\/strong>For example, CertPanel SSL Monitor automatically:&nbsp;\n<ul class=\"wp-block-list\">\n<li>detects when servers are still using old and\/or wrongly configured SSL protocols<\/li>\n\n\n\n<li>provides actionable and detailed vulnerability reports to facilitate fast remediation<\/li>\n\n\n\n<li>offers real-time alerts when there are issues <a>regarding<\/a> SSL\/TLS that must be dealt with quickly.&nbsp;<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Ensure your servers are updated with the latest OpenSSL versions<\/strong>. This will enable you to patch vulnerabilities such as <strong>CVE-2016-0800<\/strong>. Regular maintenance prevents exploitation through outdated libraries.&nbsp;<\/li>\n\n\n\n<li><strong>Enforce modern encryption standards<\/strong>. Replace weak cipher suites with secure ones like TLS 1.2 or higher. Avoid configurations allowing cross-protocol attacks.&nbsp;<\/li>\n\n\n\n<li><strong>Test your servers regularly<\/strong>: Run periodic scans using&nbsp;<a href=\"https:\/\/certpanel.com\/ssl-monitor\/\">CertPanel\u2019s suite of tools<\/a> to ensure your systems are safe from newly discovered vulnerabilities.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1013\" height=\"408\" src=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-35-1024x448-1.jpeg\" alt=\"\" class=\"wp-image-1725\" srcset=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-35-1024x448-1.jpeg 1013w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-35-1024x448-1-300x121.jpeg 300w, https:\/\/certpanel.com\/resources\/wp-content\/uploads\/image-35-1024x448-1-768x309.jpeg 768w\" sizes=\"auto, (max-width: 1013px) 100vw, 1013px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Final Thoughts<\/strong><\/h2>\n\n\n\n<p>The DROWN attack points to the need for security best practices and maintaining SSL\/TLS configurations to keep them up to date. Although the SSLv2 protocol is dated, its potential presence within modern server configurations still poses severe risks to vulnerable servers and other systems. <\/p>\n\n\n\n<p>With the use of tools such as CertPanel SSL Monitor, updated servers, and compliance with modern encryption standards, one can protect one&#8217;s system from DROWN as well as other similar vulnerabilities.&nbsp;<\/p>\n\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\"><strong>FAQs<\/strong>&nbsp;<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1746460986925\"><strong class=\"schema-faq-question\"><strong>Q: How does CertPanel SSL Monitor help in detecting vulnerabilities?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>A:<\/strong> The CertPanel&#8217;s SSL Monitor offers real-time scanning with detailed reports on SSL\/TLS configurations to help detect such vulnerabilities as the DROWN attack and raise alerts for misconfigurations for prompt action.\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1746461008892\"><strong class=\"schema-faq-question\"><strong>Q: Is disabling SSLv2 enough to mitigate DROWN?<\/strong>\u00a0<\/strong> <p class=\"schema-faq-answer\"><strong>A:<\/strong> Disabling SSLv2 is a good starting point, but you need to update OpenSSL libraries and force strong cipher suites for all connections for complete protection.\u00a0<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>What Is the SSL DROWN Attack Vulnerability?&nbsp; The DROWN attack, or Decrypting RSA with Obsolete and Weakened Encryption, is an SSL\/TLS vulnerability that allows attackers to decrypt encrypted traffic. It targets servers that still support the outdated SSL 2.0 (SSLv2) protocol and share cryptographic keys between SSLv2 and modern TLS services.&nbsp;&nbsp; This flaw, which is<\/p>\n","protected":false},"author":10,"featured_media":1836,"parent":1130,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"wp-custom-template-expert-guides-detail","meta":{"_acf_changed":false,"_eb_attr":"","footnotes":""},"class_list":["post-1538","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is the DROWN Attack? How to Patch the CVE-2016-0800 Exploit<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/certpanel.com\/resources\/what-is-the-drown-attack-how-to-patch-the-cve-2016-0800-exploit\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is the DROWN Attack? How to Patch the CVE-2016-0800 Exploit\" \/>\n<meta property=\"og:description\" content=\"What Is the SSL DROWN Attack Vulnerability?&nbsp; The DROWN attack, or Decrypting RSA with Obsolete and Weakened Encryption, is an SSL\/TLS vulnerability that allows attackers to decrypt encrypted traffic. It targets servers that still support the outdated SSL 2.0 (SSLv2) protocol and share cryptographic keys between SSLv2 and modern TLS services.&nbsp;&nbsp; This flaw, which is\" \/>\n<meta property=\"og:url\" content=\"https:\/\/certpanel.com\/resources\/what-is-the-drown-attack-how-to-patch-the-cve-2016-0800-exploit\/\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-23T12:26:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/certpanel.com\/resources\/wp-content\/uploads\/prevent-drown-feature.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"418\" \/>\n\t<meta property=\"og:image:height\" content=\"200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"9 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/certpanel.com\\\/resources\\\/what-is-the-drown-attack-how-to-patch-the-cve-2016-0800-exploit\\\/\",\"url\":\"https:\\\/\\\/certpanel.com\\\/resources\\\/what-is-the-drown-attack-how-to-patch-the-cve-2016-0800-exploit\\\/\",\"name\":\"What Is the DROWN Attack? 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