CVE-2021-41611

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

Description

An issue was discovered in Squid 5.0.6 through 5.1.x before 5.2. When validating an origin server or peer certificate, Squid may incorrectly classify certain certificates as trusted. This problem allows a remote server to obtain security trust well improperly. This indication of trust may be passed along to clients, allowing access to unsafe or hijacked services.

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-2021-41611

OS impact

OS	Version	Status	Fixed in
arch		fixed	`5.2-1`
debian	bookworm	fixed	`5.2-1`
debian	bullseye	fixed	`0`
debian	forky	fixed	`5.2-1`
debian	sid	fixed	`5.2-1`
debian	trixie	fixed	`5.2-1`

References

https://security-tracker.debian.org/tracker/CVE-2021-41611

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