Last Modified: Feb 24, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1, 16.0.1.2, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 16.1.6.1, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 21.0.0, 21.0.0.1
Opened: Feb 06, 2026 Severity: 2-Critical
Connection gets aborted with logs similar to the following on ltm logs : TCL error: /Common/[irule-name] <EVENT_NAME> - proc [Proc name] not found
Incoming client connections may get aborted.
1. iRule is using proc command 2. iRule proc is renamed or deleted while the iRule is in use.
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