CVE-2009-2621: Squid-Cache Squid

Medium severity, CVSS 5.0. EPSS: 23% chance of exploitation in the next 30 days.

Squid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 does not properly enforce "buffer limits and related bound checks," which allows remote attackers to cause a denial of service via (1) an incomplete request or (2) a request with a large header size, related to (a) HttpMsg.cc and (b) client_side.cc.

Affected products

• Squid-Cache Squid: version 3.0 only; version 3.1 only; version 3.1.0.1 only; version 3.1.0.2 only; version 3.1.0.3 only; version 3.1.0.4 only

Published 2009-07-28. Last modified 2026-06-16.