CVE-2009-3766: n/a vulnerability

CVE-2009-3766: mutt_ssl.c in mutt 1.5.16 and other versions before 1.5.19, when OpenSSL is used, does not verify the domai...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 06:38 UTC (UTC+00:00)

Security readout for executives and security teams

Older Mutt releases using OpenSSL could accept a valid TLS certificate even when it was issued for a different server name. A network-positioned attacker could impersonate an SSL server and intercept or alter mail traffic. The bundle does not provide a CVSS score or evidence of active exploitation. Exposure is most likely on systems running Mutt before 1.5.19 with OpenSSL-enabled SSL/TLS connections. The source bundle does not provide CPEs, downstream package mappings, or deployment prevalence. Treat as a targeted confidentiality and integrity risk for users still running legacy Mutt. It is not documented as actively exploited, but exposure should be retired during normal vulnerability remediation cycles. Mitigation focus: Upgrade Mutt to version 1.5.19 or later.; Check operating system vendor advisories for backported package fixes.; Prioritize users on untrusted or shared networks..

Prepared: Jun 28, 2026, 18:15 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Oct 23, 2009, 19:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

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1Source links

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Source materials

CVE List V5 sourceCVE List V5

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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