Medium 6.8Published Oct 23, 2009

CVE-2009-3766mutt_ssl.c in mutt 1.5.16 and other versions before 1.5.19, when OpenSSL is used, does not verify the domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-…

Updated under an hour ago (Nov 2, 2026, 1:40 AM ET)

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mutt_ssl.c in mutt 1.5.16 and other versions before 1.5.19, when OpenSSL is used, does not verify the domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

CVSS: 6.8 MEDIUM (v2.0, NVD)AV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness (CWE): CWE-310
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

mutt mutt mutt:mutt	from 1.5.16 before 1.5.19	NVD

References

References

http://dev.mutt.org/trac/ticket/3087	patch, vendor-advisory
http://marc.info/?l=oss-security&m=125198917018936&w=2	mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2009/10/26/1	mailing-list, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.