CVE-2009-0478: Squid

Medium severity, CVSS 5.0. EPSS: 72% chance of exploitation in the next 30 days.

Squid 2.7 to 2.7.STABLE5, 3.0 to 3.0.STABLE12, and 3.1 to 3.1.0.4 allows remote attackers to cause a denial of service via an HTTP request with an invalid version number, which triggers a reachable assertion in (1) HttpMsg.c and (2) HttpStatusLine.c.

Affected products

• Squid Squid: version 2.7.stable1 only; version 2.7.stable2 only; version 2.7.stable3 only; version 2.7.stable4 only; version 2.7.stable5 only; version 3.0.stable1 only; …

Published 2009-02-08. Last modified 2026-06-16.