Is CVE-2011-4096 in the CISA KEV catalog?

No. CVE-2011-4096 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-4096?

CVE-2011-4096 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2011-4096?

CVE-2011-4096 has an EPSS score of 38.32% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2011-4096

MEDIUMEPSS 98th pctl

5.0

CVSS v2

NVD

Description

The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.

CWE-399

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

38.32%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

References

http://bugs.squid-cache.org/show_bug.cgi?id=3237#c12
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
http://secunia.com/advisories/46609
http://secunia.com/advisories/47459
http://www.mandriva.com/security/advisories?name=MDVSA-2011:193
http://www.openwall.com/lists/oss-security/2011/10/31/5
http://www.openwall.com/lists/oss-security/2011/11/01/3
http://www.redhat.com/support/errata/RHSA-2011-1791.html
http://www.securitytracker.com/id?1026265
http://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID_3_1_16.html

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.