CVE-2021-41611: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 35 only
• Squid-Cache Squid: from 5.0.6, before 5.2 (fixed in 5.2)

Published 2021-10-18. Last modified 2026-06-17.