CVE-2016-3948: Squid-Cache Squid

High severity, CVSS 7.5. EPSS: 35.3% chance of exploitation in the next 30 days.

Squid 3.x before 3.5.16 and 4.x before 4.0.8 improperly perform bounds checking, which allows remote attackers to cause a denial of service via a crafted HTTP response, related to Vary headers.

Affected products

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

Published 2016-04-07. Last modified 2026-06-17.