CVE-2009-3942

Severity: medium (CVSS 6.4 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-11-16 · updated 2026-06-16
Weakness: CWE-310

Description

Martin Lambers msmtp before 1.4.19, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the (1) subject's Common Name or (2) Subject Alternative Name 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.

Affected products

Martin Lambers Msmtp: through 1.4.18; 0.2.5, 0.2.6, 0.3.0, 0.3.1, 0.4.0, 0.4.1 (+37)

References

http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00007.html
http://msmtp.sourceforge.net/news.html
http://secunia.com/advisories/37321
http://www.vupen.com/english/advisories/2009/3224
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00007.html
http://msmtp.sourceforge.net/news.html
http://secunia.com/advisories/37321
http://www.vupen.com/english/advisories/2009/3224

Get alerted when CVE-2009-3942 or the next vulnerability affects your stack