CVE-2009-3765: n/a vulnerability

CVE-2009-3765: 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...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 20:22 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw affects old Mutt email clients using OpenSSL. A hostile network actor could make a fake server certificate look valid by abusing a null character in the certificate name, potentially intercepting SSL-protected email connections. Exposure is likely limited to legacy systems running Mutt 1.5.19 or 1.5.20 with OpenSSL enabled. The structured affected-product metadata is incomplete, but the CVE description names those versions and the OpenSSL condition. Treat this as a legacy-client cleanup issue unless vulnerable Mutt versions remain in sensitive environments. It can undermine SSL trust for email connections, but the sources do not show active exploitation. Mitigation focus: Upgrade Mutt using trusted vendor packages or vendor guidance.; Confirm the installed build includes the mutt_ssl.c fix.; Prioritize systems handling sensitive email over untrusted 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.

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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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CVE List V5 sourceCVE List V5

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Products and packages named in the record

VendorProductVersion / packageStatus

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