CVE-2013-4115

Buffer overflow in the idnsALookup function in dns_internal.cc in Squid 3.2 through 3.2.11 and 3.3 through 3.3.6 allows remote attackers to cause a denial of service (memory corruption and server termination) via a long name in a DNS lookup request.

Published: 2013-08-09 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-4115 is rated High Risk (69.6/100): CVSS High severity, with high exploitation likelihood (EPSS 75.06%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +9.52% over the last day, indicating growing attacker interest. 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-2013-4115

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 2025-12-28 65.54% 75.06% +9.52%
2 2025-12-27 75.06% 65.54% -9.52%
3 2025-10-28 — 75.06% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-4115

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2013-4115

OS Trackers for CVE-2013-4115

vendor priority summary link
debian unimportant CVE-2013-4115 unimportant priority: Debian including 1 source packages (squid), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2013-4115
gentoo normal CVE-2013-4115: 1 GLSA(s) (201309-22), 1 atom(s) (net-proxy/squid); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-4115
redhat low — https://access.redhat.com/security/cve/CVE-2013-4115
ubuntu medium CVE-2013-4115 medium priority: Ubuntu including 1 source packages (squid3), 5 status rows across 5 suites (lucid, precise, quantal, raring, upstream): not-affected 4, released 1. https://ubuntu.com/security/CVE-2013-4115

Affected software / configurations for CVE-2013-4115

Vendor Product Version Raw CPE
opensuse opensuse 11.4 cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
opensuse opensuse 12.2 cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
opensuse opensuse 12.3 cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
squid-cache squid 3.2.0.2 cpe:2.3:a:squid-cache:squid:3.2.0.2:*:*:*:*:*:*:*
squid-cache squid 3.2.0.3 cpe:2.3:a:squid-cache:squid:3.2.0.3:*:*:*:*:*:*:*
squid-cache squid 3.2.0.4 cpe:2.3:a:squid-cache:squid:3.2.0.4:*:*:*:*:*:*:*
squid-cache squid 3.2.0.5 cpe:2.3:a:squid-cache:squid:3.2.0.5:*:*:*:*:*:*:*
squid-cache squid 3.2.0.6 cpe:2.3:a:squid-cache:squid:3.2.0.6:*:*:*:*:*:*:*
squid-cache squid 3.2.0.7 cpe:2.3:a:squid-cache:squid:3.2.0.7:*:*:*:*:*:*:*
squid-cache squid 3.2.0.8 cpe:2.3:a:squid-cache:squid:3.2.0.8:*:*:*:*:*:*:*
squid-cache squid 3.2.0.9 cpe:2.3:a:squid-cache:squid:3.2.0.9:*:*:*:*:*:*:*
squid-cache squid 3.3.0 cpe:2.3:a:squid-cache:squid:3.3.0:*:*:*:*:*:*:*
squid-cache squid 3.3.0.2 cpe:2.3:a:squid-cache:squid:3.3.0.2:*:*:*:*:*:*:*
squid-cache squid 3.3.0.3 cpe:2.3:a:squid-cache:squid:3.3.0.3:*:*:*:*:*:*:*
squid-cache squid 3.3.1 cpe:2.3:a:squid-cache:squid:3.3.1:*:*:*:*:*:*:*
squid-cache squid 3.3.2 cpe:2.3:a:squid-cache:squid:3.3.2:*:*:*:*:*:*:*
squid-cache squid 3.3.3 cpe:2.3:a:squid-cache:squid:3.3.3:*:*:*:*:*:*:*
squid-cache squid 3.3.4 cpe:2.3:a:squid-cache:squid:3.3.4:*:*:*:*:*:*:*
squid-cache squid 3.3.5 cpe:2.3:a:squid-cache:squid:3.3.5:*:*:*:*:*:*:*
squid-cache squid 3.3.6 cpe:2.3:a:squid-cache:squid:3.3.6:*:*:*:*:*:*:*

References for CVE-2013-4115

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
http://lists.opensuse.org/opensuse-updates/2013-09/msg00024.html Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2013-09/msg00025.html Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2013-09/msg00030.html Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2013-09/msg00032.html Vendor Advisory
http://lists.opensuse.org/opensuse-updates/2013-09/msg00033.html Vendor Advisory
http://secunia.com/advisories/54076 Vendor Advisory
http://secunia.com/advisories/54834 Vendor Advisory
http://secunia.com/advisories/54839 Vendor Advisory
http://www.openwall.com/lists/oss-security/2013/07/11/8
http://www.securityfocus.com/bid/61111
http://www.squid-cache.org/Advisories/SQUID-2013_2.txt Vendor Advisory
http://www.squid-cache.org/Versions/v3/3.0/changesets/squid-3.0-9200.patch Patch
http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10487.patch Patch
http://www.squid-cache.org/Versions/v3/3.2/changesets/squid-3.2-11823.patch Patch
http://www.squid-cache.org/Versions/v3/3.3/changesets/squid-3.3-12587.patch Patch
https://exchange.xforce.ibmcloud.com/vulnerabilities/85564
cvelogic Threat Intelligence