Bug ID 2163777: Tmm core on fw_nat_classify() while nat rule configuration is being changed

Last Modified: Jan 14, 2026

Affected Product(s):
BIG-IP AFM(all modules)

Known Affected Versions:
17.1.3

Opened: Dec 02, 2025

Severity: 3-Major

Symptoms

TMM may crash with a segmentation fault in fw_nat_classify() during NAT rule configuration changes, causing service disruption.

Impact

Traffic disrupted while tmm restarts.

Conditions

Occurs during NAT rule delete configuration modification

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips