CVE-2011-4318

Severity: medium (CVSS 5.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-03-07 · updated 2026-06-16
Weakness: CWE-20

Description

Dovecot 2.0.x before 2.0.16, when ssl or starttls is enabled and hostname is used to define the proxy destination, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via a valid certificate for a different hostname.

Affected products

dovecot: 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5 (+10)

References

http://hg.dovecot.org/dovecot-2.0/rev/5e9eaf63a6b1
http://rhn.redhat.com/errata/RHSA-2013-0520.html
http://secunia.com/advisories/46886
http://secunia.com/advisories/52311
http://www.dovecot.org/list/dovecot-news/2011-November/000200.html
http://www.openwall.com/lists/oss-security/2011/11/18/5
http://www.openwall.com/lists/oss-security/2011/11/18/7
https://bugs.gentoo.org/show_bug.cgi?id=390887
https://bugzilla.redhat.com/show_bug.cgi?id=754980
http://hg.dovecot.org/dovecot-2.0/rev/5e9eaf63a6b1
http://rhn.redhat.com/errata/RHSA-2013-0520.html
http://secunia.com/advisories/46886

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