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Fencer Intel
medium 5.8

CVE-2011-1429 json

Mutt does not verify that the smtps server hostname matches the domain name of the subject of an X.509 certificate, which allows man-in-the…

published 2011-03-16 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1434

cvss
5.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

Mutt does not verify that the smtps server hostname matches the domain name of the subject of an X.509 certificate, which allows man-in-the-middle attackers to spoof an SSL SMTP server via an arbitrary certificate, a different vulnerability than CVE-2009-3766.

Patch / fix

  • mutt Debian 14, Debian 13, Debian 12 1.5.21-5

debian advisories DEBIAN-CVE-2011-1429

  • mutt RHEL 6 5:1.5.20-2.20091214hg736b6a.el6_1.1

red hat advisories RHSA-2011:0959

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-2011-1429 updated cvss 4.3

mutt: SSL host name check may be skipped when verifying certificate chain

  • Red Hat Enterprise Linux Server (v. 6) mutt 1.5.20-2.20091214hg736b6a.el6_1.1
    fixed: vendor fix RHSA-2011:0959
  • Red Hat Enterprise Linux 4 mutt Red Hat Enterprise Linux 5 mutt
    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

1.47% chance of exploitation in the next 30 days, higher than 74% 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.