CVE-2009-3765

Name: CVE-2009-3765
Creator: NVD / NIST
Published: 2009-10-23T19:30:00.203+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.08%

Last modified Jun 16, 2026

CVE-2009-3765 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

1.08%

61.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-310

Affected Software

Vendor	Product	Versions
Mutt	Mutt	1.5.19
Mutt	Mutt	1.5.20

References

Timeline

Published: Oct 23, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-3765?

How severe is CVE-2009-3765?

Severity scoring for CVE-2009-3765 is pending analysis. The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2009-3765?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-3765?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST