CVE-2009-3766

Name: CVE-2009-3766
Creator: NVD / NIST
Published: 2009-10-23T19:30:00.233+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.14%

Last modified Jun 16, 2026

CVE-2009-3766 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.14% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.14%

62.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-310

Affected Software

Vendor	Product	Versions
Mutt	Mutt	>= 1.5.16, < 1.5.19

References

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

Timeline

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

Frequently Asked Questions

What is CVE-2009-3766?

How severe is CVE-2009-3766?

Severity scoring for CVE-2009-3766 is pending analysis. The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2009-3766?

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-2009-3766?

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

Scan your code now

Source: NVD / NIST