CVE-2011-4968 Security feature bypass in nginx

What is CVE-2011-4968?

CVE-2011-4968 is a medium-severity vulnerability in Debian Debian Linux, published on 19 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)

Weakness: CWE-20

Which versions are affected by CVE-2011-4968?

It affects 2 products.

Products include Debian Debian Linux, F5 Nginx.

How do I fix CVE-2011-4968?

Upgrade to a fixed version.

Is CVE-2011-4968 being exploited?

There is no known exploitation of CVE-2011-4968 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2011-4968, GHSA-x9wg-g9hq-p992, UBUNTU-CVE-2011-4968.