CVE-2010-2951: Squid-Cache Squid

Medium severity, CVSS 5.0. EPSS: 31.5% chance of exploitation in the next 30 days.

dns_internal.cc in Squid 3.1.6, when IPv6 DNS resolution is not enabled, accesses an invalid socket during an IPv4 TCP DNS query, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via vectors that trigger an IPv4 DNS response with the TC bit set.

Affected products

• Squid-Cache Squid: version 3.1.6 only

Published 2010-10-12. Last modified 2026-06-16.