CVE-2015-6563: Apple Mac OS X

Medium severity, CVSS 6.4. EPSS: 0.4% chance of exploitation in the next 30 days.

The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.

Affected products

• Apple Mac OS X: up to and including 10.11.0
• OpenBSD OpenSSH: up to and including 6.9

Published 2015-08-24. Last modified 2026-06-17.