CVE-2021-30501

medium

Published — · Modified —

CVSS v3

—

CVSS v2

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VIR risk

5.5

Description

An assertion abort was found in upx MemBuffer::alloc() in mem.cpp, in version UPX 4.0.0. The flow allows attackers to cause a denial of service (abort) via a crafted file.

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-2021-30501

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-2021-30501

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