CVE-2010-2951

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.

Published: 2010-10-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2010-2951 is rated Moderate Risk (49.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 31.46%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2010-2951

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 55.18% 31.46% -23.72%
2 2025-12-28 51.59% 55.18% +3.60%
3 2025-12-27 — 51.59% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2010-2951

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2010-2951

OS Trackers for CVE-2010-2951

vendor priority summary link
gentoo high CVE-2010-2951: 1 GLSA(s) (201110-24), 1 atom(s) (net-proxy/squid); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2010-2951
redhat low — https://access.redhat.com/security/cve/CVE-2010-2951
ubuntu medium CVE-2010-2951 medium priority: Ubuntu including 1 source packages (squid3), 7 status rows across 7 suites (dapper, hardy, jaunty, karmic, lucid, maverick, upstream): not-affected 3, DNE 1, ignored 1, needs-triage 1, released 1. https://ubuntu.com/security/CVE-2010-2951

Affected software / configurations for CVE-2010-2951

Vendor Product Version Raw CPE
squid-cache squid 3.1.6 cpe:2.3:a:squid-cache:squid:3.1.6:*:*:*:*:*:*:*

References for CVE-2010-2951

cvelogic Threat Intelligence