CVE-2016-2047: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 3.7% chance of exploitation in the next 30 days.

The ssl_verify_server_cert function in sql-common/client.c in MariaDB before 5.5.47, 10.0.x before 10.0.23, and 10.1.x before 10.1.10; Oracle MySQL 5.5.48 and earlier, 5.6.29 and earlier, and 5.7.11 and earlier; and Percona Server do not properly 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 a "/CN=" string in a field in a certificate, as demonstrated by "/OU=/CN=bar.com/CN=foo.com."

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.10 only; version 16.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• MariaDB MariaDB: from 5.5.20, before 5.5.47 (fixed in 5.5.47); from 10.0.0, before 10.0.23 (fixed in 10.0.23); from 10.1.0, before 10.1.10 (fixed in 10.1.10)
• Opensuse Leap: version 42.1 only
• Oracle Linux: version 7 only
• Oracle MySQL: from 5.5.0, up to and including 5.5.48; from 5.6.0, up to and including 5.6.29; from 5.7.0, up to and including 5.7.11
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only

Published 2016-01-27. Last modified 2026-06-17.