CVE-2021-39241 Other in n/a

What is CVE-2021-39241?

CVE-2021-39241 is a medium-severity vulnerability in Debian Debian Linux, published on 17 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in HAProxy 2.0 before 2.0.24, 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. An HTTP method name may contain a space followed by the name of a protected resource. It is possible that a server would interpret this as a request for that protected resource, such as in the "GET /admin? HTTP/1.1 /static/images HTTP/1.1" example.

Which versions are affected by CVE-2021-39241?

1 open source package ship an affected version, including haproxy. It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Haproxy Haproxy.

How do I fix CVE-2021-39241?

Upgrade haproxy to a fixed version for your release line: 2.0.24, 2.2.16, 2.3.13 or 2.4.3.

Is CVE-2021-39241 being exploited?

There is no known exploitation of CVE-2021-39241 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 BIT-haproxy-2021-39241, DEBIAN-CVE-2021-39241, GHSA-6x47-wc8c-3q36, UBUNTU-CVE-2021-39241, USN-5042-1.