Last Modified: Sep 02, 2026
Affected Product(s):
BIG-IP LTM
Fixed In:
21.1.0.2, 17.5.1.9, 17.1.3.5
Opened: Jul 16, 2026 Severity: 2-Critical
TCL error "Invalid index 0 in class" thrown in /var/log/ltm for external data group
iRule execution will fail
- virtual server with iRule - iRule using the class command with the element option class element -value 0 <external_dg>
None
Added code for proper boundary check for class item