Last Modified: Apr 21, 2026
Affected Product(s):
BIG-IP PEM
Known Affected Versions:
17.1.3, 17.1.3.1, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5, 21.0.0, 21.0.0.1
Opened: Apr 06, 2026 Severity: 2-Critical
On BIG-IP, running pem_sessiondump --list when PEM subscriber sessions have custom attributes may crash with a segmentation fault and generate a core in /var/core.
The pem_sessiondump diagnostic utility crashes. No impact to data-plane traffic or TMM. Administrators are unable to use pem_sessiondump to list subscriber sessions until the utility is re-run.
This happens when PEM is provisioned with RADIUS subscriber sessions that have custom attributes and a transient memcached connection interruption occurs while pem_sessiondump is iterating sessions.
Re-run pem_sessiondump --list. The crash occurs only when a transient memcached connection interruption coincides with the session iteration. Retrying typically succeeds.
None