CVE-2010-2951 Denial of service in n/a
Remote attackers can cause a denial of service in Squid proxy servers by triggering an assertion failure during IPv4 DNS queries when IPv6 resolution is disabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2010-2951?
CVE-2010-2951 is a medium-severity denial of service vulnerability in Squid-Cache Squid, published on 12 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2010-2951?
It affects 1 product.
Products include Squid-Cache Squid.
How do I fix CVE-2010-2951?
No fix has been published for CVE-2010-2951 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2010-2951 being exploited?
There is no known exploitation of CVE-2010-2951 in the wild and no public exploit code.
Other vulnerabilities in Squid-Cache Squid
- CVE-2025-62168 Squid vulnerable to information disclosure via authentication credential leakage in error handling
- CVE-2025-54574 Squid's URN Handling can lead to Buffer Overflow
- CVE-2026-33526 Squid vulnerable to Denial of Service in ICP Request handling
- CVE-2026-32748 Squid has Denial of Service in ICP Response handling
- CVE-2023-50269 SQUID-2023:10 Denial of Service in HTTP Request parsing
Sources
Also known as GHSA-9vw9-fpw4-vvf6.