CVE-2013-4548: OpenBSD OpenSSH

Medium severity, CVSS 6.0. EPSS: 2.7% chance of exploitation in the next 30 days.

The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.

Affected products

• OpenBSD OpenSSH: version 6.2 only; version 6.3 only

Published 2013-11-08. Last modified 2026-06-16.