CVE-2012-5662: Paul Mattes x3270

Medium severity, CVSS 5.8. EPSS: 0.6% chance of exploitation in the next 30 days.

x3270 before 3.3.12ga12 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.

Affected products

• Paul Mattes x3270: up to and including 3.3.12; version 3.3.5 only; version 3.3.6 only; version 3.3.7 only; version 3.3.8 only; version 3.3.9 only; …

Published 2014-05-27. Last modified 2026-06-16.