CVE-2011-4096

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 37.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-11-17 · updated 2026-06-16
Weakness: CWE-399

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.

Affected products

Squid: through 3.1.15; 3.0, 3.0-rc1, 3.0-rc4, 3.0.stable1, 3.0.stable2, 3.0.stable3 (+58)

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
http://bugs.squid-cache.org/show_bug.cgi?id=3237#c12

Get alerted when CVE-2011-4096 or the next vulnerability affects your stack