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Security Advisory

Nginx 1.2.8 Security Vulnerability: CVE-2013-2070 Guide

    📅 June 07, 2026
    ·⏱ 5 min read
    ·🔒 SiteRecipe Security Team
  

⚠ 393 websites still running Nginx 1.2.8 → View full list

Total

Medium

Nginx 1.2.8 contains a medium-severity vulnerability (CVE-2013-2070) that could expose your website to denial of service attacks and data breaches. This security flaw affects approximately 393 websites still running this outdated version, making it a critical concern for server administrators.

The vulnerability exists in the proxy_pass module when handling requests to untrusted HTTP servers. Attackers can exploit this weakness to crash your server and potentially access sensitive information from worker processes. Understanding this vulnerability and taking immediate action is essential for protecting your infrastructure.

This comprehensive guide will help you identify if your Nginx installation is vulnerable and provide step-by-step instructions to remediate the risk before attackers exploit it.

What is Nginx 1.2.8?

Nginx is a lightweight, high-performance web server software used by millions of websites worldwide to deliver content quickly and reliably. Unlike other web servers, Nginx uses an event-driven architecture that allows it to handle thousands of simultaneous connections with minimal resource consumption. Version 1.2.8, released in 2012, was a popular stable release that many organizations deployed across their infrastructure.

Version 1.2.8 is now considered legacy software and has reached end-of-life status. This means the Nginx development team no longer releases security patches for this version, leaving any remaining installations vulnerable to newly discovered exploits. Continuing to run outdated versions like 1.2.8 creates significant security risks, as attackers actively target known vulnerabilities in abandoned software versions.

Key Vulnerabilities in Nginx 1.2.8

1 CVEs found. The most critical are explained below.

MEDIUM CVE-2013-2070 5.8/10 · CVSS v2 ⏱ Within 7 days

Nginx crashes when connecting to untrusted servers

Nginx versions 1.2.8 and earlier have a weakness when your website connects to external servers to fetch content. A malicious server can send specially crafted responses that crash your Nginx web server and expose private data stored in its memory.

Impact: Your website could go down temporarily, and attackers could steal sensitive information like user data, passwords, or API keys that were in your server's memory at the time of the attack.

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How to Check If Your Website Is Affected

1 SSH into your server and run the command: nginx -v to display your installed Nginx version
2 Compare the output against version 1.2.8 - if it matches, your server is vulnerable to CVE-2013-2070
3 Check your Nginx configuration file (typically at /etc/nginx/nginx.conf) for proxy_pass directives pointing to external servers

How to Fix These Vulnerabilities

1 Backup your current Nginx configuration by running: sudo cp -r /etc/nginx /etc/nginx.backup
2 Update Nginx to the latest stable version using your system package manager: sudo apt-get update && sudo apt-get install nginx (for Ubuntu/Debian) or sudo yum update nginx (for CentOS/RHEL)
3 Review your Nginx configuration files, especially proxy_pass settings, and implement additional security headers and access controls
4 Test your configuration with nginx -t, then reload Nginx using sudo systemctl restart nginx to apply the security patch

Conclusion

CVE-2013-2070 represents a serious security risk for any organization still running Nginx 1.2.8. The vulnerability's potential to cause denial of service attacks and expose sensitive data makes immediate remediation non-negotiable. Upgrading to a current, patched version of Nginx is the most effective way to protect your website and user data.

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Frequently Asked Questions

Can I safely ignore CVE-2013-2070 if my proxy_pass only connects to trusted servers?

While the risk is lower with trusted servers, Nginx itself contains the vulnerable code that could be exploited if those servers are ever compromised or spoofed. Security best practices recommend always patching critical vulnerabilities regardless of your specific configuration. Additionally, what constitutes a 'trusted' server may change over time.

Will upgrading Nginx cause my website to go offline?

Upgrading Nginx typically requires only a brief restart (usually seconds) if done properly. By following our fix guide and testing your configuration beforehand, you can minimize downtime. Many organizations perform upgrades during scheduled maintenance windows to ensure zero disruption to visitors.

How often should I check for security vulnerabilities in my server software?

Security vulnerabilities are discovered continuously, so you should check at least monthly or whenever you receive security advisories. Automated tools like SiteRecipe.com provide continuous monitoring and instant alerts when new vulnerabilities affecting your software are discovered, eliminating the need for manual checking.

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DISCLAIMER: This report is based on publicly available CVE data from the National Vulnerability Database (NVD) maintained by NIST. Detection of a technology version does not confirm active exploitation on any specific website. For informational purposes only. SiteRecipe is not responsible for actions taken based on this report. Always consult a qualified security professional.

Source: nvd.nist.gov · Published: June 07, 2026 · SiteRecipe.com