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CVE-2013-4115

40
FAUCET Score

CVE-2013-4115 describes a buffer overflow vulnerability in the idnsALookup function within Squid versions 3.2 through 3.2.11 and 3.3 through 3.3.6. This flaw allows remote attackers to trigger a denial of service by sending a crafted, long DNS lookup request, leading to memory corruption and server termination. With a CVSS score of 7.5, this vulnerability is considered highly severe, requiring no authentication and having low attack complexity, potentially impacting confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
11.4CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
12.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:12.2:*:*:*:*:*:*:*
12.3CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
3.2.0.2CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.2.0.2:*:*:*:*:*:*:*
3.2.0.3CPE matchmatch criteria
cpe:2.3:a:squid-cache:squid:3.2.0.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
43.26%
Probability of exploitation in next 30 days
EPSS Percentile
98.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.4326 is in the 97th percentile among its peer group of 51,551 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: squid-7:2.6.STABLE21-7.el5_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: squid-7:3.1.10-22.el6_5
View patch
susevendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2013-4115Low

squid: buffer overflow when processing overly long DNS names (SQUID-2013:2)

Jul 10, 2013

References

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