CVE-2021-20285

medium

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

5.5

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.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-20285

OS impact

OS	Version	Status	Fixed in
arch		affected
debian	bullseye	affected
debian	forky	fixed	`4.2.2-1`
debian	sid	fixed	`4.2.2-1`
debian	trixie	fixed	`4.2.2-1`

References

https://security-tracker.debian.org/tracker/CVE-2021-20285

Verify integrity in audit chain (admin only). AS-IS.