| Name | CVE-2021-41524 |
| Description | While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| apache2 (PTS) | jessie, jessie (lts) | 2.4.10-10+deb8u25 | fixed |
| stretch (security) | 2.4.25-3+deb9u13 | fixed |
| stretch (lts), stretch | 2.4.25-3+deb9u15 | fixed |
| buster | 2.4.38-3+deb10u8 | fixed |
| buster (security) | 2.4.38-3+deb10u10 | fixed |
| bullseye | 2.4.56-1~deb11u2 | fixed |
| bullseye (security) | 2.4.59-1~deb11u1 | fixed |
| bookworm | 2.4.57-2 | fixed |
| bookworm (security) | 2.4.59-1~deb12u1 | fixed |
| sid, trixie | 2.4.59-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| apache2 | source | jessie | (not affected) | | | |
| apache2 | source | stretch | (not affected) | | | |
| apache2 | source | buster | (not affected) | | | |
| apache2 | source | bullseye | (not affected) | | | |
| apache2 | source | (unstable) | 2.4.50-1 | | | |
Notes
[bullseye] - apache2 <not-affected> (Vulnerable code not present, only affects 2.4.49)
[buster] - apache2 <not-affected> (Vulnerable code not present, only affects 2.4.49)
[stretch] - apache2 <not-affected> (Vulnerable code not present, only affects 2.4.49)
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-41524
Fixed by: https://svn.apache.org/r1893655
https://www.openwall.com/lists/oss-security/2021/10/05/1
[jessie] - apache2 <not-affected> (Vulnerable code not present, only affects 2.4.49)