CVE-2020-14058: Fedoraproject Fedora

High severity, CVSS 7.5. EPSS: 2.5% chance of exploitation in the next 30 days.

An issue was discovered in Squid before 4.12 and 5.x before 5.0.3. Due to use of a potentially dangerous function, Squid and the default certificate validation helper are vulnerable to a Denial of Service when opening a TLS connection to an attacker-controlled server for HTTPS. This occurs because unrecognized error values are mapped to NULL, but later code expects that each error value is mapped to a valid error string.

Affected products

• Fedoraproject Fedora: version 31 only
• Netapp Cloud Manager: affected versions not specified
• Squid-Cache Squid: from 3.1, up to and including 3.5.28; from 4.0, before 4.12 (fixed in 4.12); from 5.0, before 5.0.3 (fixed in 5.0.3)

Published 2020-06-30. Last modified 2026-06-17.