| Name | CVE-2021-26691 |
| Description | In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| References | DLA-2706-1, DSA-4937-1 |
| NVD severity | high |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| apache2 (PTS) | stretch | 2.4.25-3+deb9u9 | vulnerable |
| stretch (security) | 2.4.25-3+deb9u11 | fixed |
| buster | 2.4.38-3+deb10u5 | fixed |
| buster (security) | 2.4.38-3+deb10u6 | fixed |
| bullseye | 2.4.48-3.1+deb11u1 | fixed |
| bullseye (security) | 2.4.51-1~deb11u1 | fixed |
| bookworm, sid | 2.4.51-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-26691
https://github.com/apache/httpd/commit/7e09dd714fc62c08c5b0319ed7b9702594faf49b