MEDIUM
CVE-2009-3766
CWE-310Published: October 23, 2009· Updated: Jun 16, 2026
6.8
CVSS v3.1
Official Description
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.
Technical Analysis
CVE-2009-3766 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityM
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityP
IntegrityP
AvailabilityP
AV:N/AC:M/Au:N/C:P/I:P/A:P
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (6)
→
http://dev.mutt.org/trac/ticket/3087Patch · Vendor Advisory
→
http://marc.info/?l=oss-security&m=125198917018936&w=2Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2009/10/26/1Mailing List · Third Party Advisory
→
http://dev.mutt.org/trac/ticket/3087Patch · Vendor Advisory
→
http://marc.info/?l=oss-security&m=125198917018936&w=2Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2009/10/26/1Mailing List · Third Party Advisory
Quick Facts
CVE IDCVE-2009-3766
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-310
CISA KEVNo
Affected2 vendor(s)
PublishedOct 23, 2009
Related CVEs (CWE-310)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2009-3766 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.