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    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 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.

    Published:Aug 11, 2009
    Last Modified:Apr 23, 2026
    EPS:Oct 23, 2009
    EPSS Score:0.00586
    CVSS Score:6.8

    Affected Products

    Vendor
    Mutt
    Product
    Mutt
    Vendor
    Openssl
    Product
    Openssl

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-43862 (CVSS 3.7) — In mutt before 2.3.2, the imap_auth_gss security level is mishandled.…
    CVE-2026-43861 (CVSS 3.7) — mutt before 2.3.2 does not check for '\0' in url_pct_decode.…
    CVE-2026-43860 (CVSS 3.7) — mutt before 2.3.2 sometimes truncates the hash_passwd by one byte for IMAP auth_cram MD5 digest.…
    CVE-2026-43859 (CVSS 3.7) — mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.…
    CVE-2024-49394 (CVSS 5.3) — In mutt and neomutt the In-Reply-To email header field is not protected by cryptographic signing which allows …
    CVE-2024-49395 (CVSS 5.3) — In mutt and neomutt, PGP encryption does not use the --hidden-recipient mode which may leak the Bcc email head…
    CVE-2024-49393 (CVSS 6.5) — In neomutt and mutt, the To and Cc email headers are not validated by cryptographic signing which allows an at…
    CVE-2023-4874 (CVSS 4.3) — Null pointer dereference when viewing a specially crafted email in Mutt >1.5.2 <2.2.12…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High