CVE-2021-41524

NameCVE-2021-41524
DescriptionWhile 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
apache2 (PTS)stretch2.4.25-3+deb9u9fixed
stretch (security)2.4.25-3+deb9u11fixed
buster2.4.38-3+deb10u5fixed
buster (security)2.4.38-3+deb10u6fixed
bullseye2.4.48-3.1+deb11u1fixed
bullseye (security)2.4.51-1~deb11u1fixed
bookworm, sid2.4.51-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
apache2sourcestretch(not affected)
apache2sourcebuster(not affected)
apache2sourcebullseye(not affected)
apache2source(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

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