CVE-2021-20285

Name	CVE-2021-20285
Description	A flaw was found in upx canPack in p_lx_elf.cpp in UPX 3.96. This flaw allows attackers to cause a denial of service (SEGV or buffer overflow and application crash) or possibly have unspecified other impacts via a crafted ELF. The highest threat from this vulnerability is to system availability.
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
upx-ucl (PTS)	bullseye	3.96-2	vulnerable
	bullseye (security)	3.96-2+deb11u1	vulnerable
	sid, trixie	4.2.4-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
upx-ucl	source	(unstable)	4.2.2-1	unimportant

https://github.com/upx/upx/issues/421
https://github.com/upx/upx/commit/13bc031163863cb3866aa6cdc018dff0697aa5d4 (v3.99)