CVE-2021-28651

Name	CVE-2021-28651
Description	An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2685-1, DSA-4924-1
Debian Bugs	988893

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
squid (PTS)	bullseye (security), bullseye	4.13-10+deb11u3	fixed
	bookworm, bookworm (security)	5.7-2+deb12u2	fixed
	sid, trixie	6.12-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
squid	source	buster	4.6-1+deb10u6	DSA-4924-1
squid	source	(unstable)	4.13-10		988893
squid3	source	stretch	3.5.23-5+deb9u7	DLA-2685-1
squid3	source	(unstable)	(unfixed)

Notes

https://github.com/squid-cache/squid/security/advisories/GHSA-ch36-9jhx-phm4
http://www.squid-cache.org/Versions/v4/changesets/squid-4-a975fd5aedc866629214aaaccb38376855351899.patch
https://megamansec.github.io/Squid-Security-Audit/urn-memleak.html