CVE-2009-3765

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-10-23 · updated 2026-06-16
Weakness: CWE-310

Description

mutt_ssl.c in mutt 1.5.19 and 1.5.20, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Affected products

mutt: 1.5.19, 1.5.20

References

http://dev.mutt.org/trac/changeset/6016:dc09812e63a3/mutt_ssl.c
http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html
http://marc.info/?l=oss-security&m=125198917018936&w=2
http://marc.info/?l=oss-security&m=125369675820512&w=2
http://dev.mutt.org/trac/changeset/6016:dc09812e63a3/mutt_ssl.c
http://lists.opensuse.org/opensuse-security-announce/2009-10/msg00001.html
http://marc.info/?l=oss-security&m=125198917018936&w=2
http://marc.info/?l=oss-security&m=125369675820512&w=2

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