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Fencer Intel
medium 5.8

CVE-2011-4318 json

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…

published 2013-03-07 13 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4252

cvss
5.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

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.

Patch / fix

  • dovecot Debian 14, Debian 13, Debian 12 1:2.0.18-1

debian advisories DEBIAN-CVE-2011-4318

  • dovecot RHEL 6 1:2.0.9-5.el6
  • dovecot-mysql RHEL 6 1:2.0.9-5.el6
  • dovecot-pgsql RHEL 6 1:2.0.9-5.el6
  • dovecot-pigeonhole RHEL 6 1:2.0.9-5.el6

red hat advisories RHSA-2013:0520

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-4318 updated cvss 5.8

dovecot: proxy destination host name not checked against SSL certificate name

  • Red Hat Enterprise Linux Server (v. 6) dovecot 2.0.9-5.el6, dovecot-mysql 2.0.9-5.el6, dovecot-pgsql 2.0.9-5.el6, dovecot-pigeonhole 2.0.9-5.el6 Red Hat Enterprise Linux Server Optional (v. 6) dovecot 2.0.9-5.el6 Red Hat Enterprise Linux Workstation (v. 6) dovecot 2.0.9-5.el6, dovecot-mysql 2.0.9-5.el6, dovecot-pgsql 2.0.9-5.el6, dovecot-pigeonhole 2.0.9-5.el6 Red Hat Enterprise Linux Workstation Optional (v. 6) dovecot 2.0.9-5.el6
    fixed: vendor fix RHSA-2013:0520
  • Red Hat Enterprise Linux 4 dovecot Red Hat Enterprise Linux 5 dovecot
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.