Symptoms

During bot signature updates, memory usage may become unusually high. In some cases, updates can fail and leave the system in an inconsistent state.

Impact

Bot signature updates may fail due to insufficient memory, which can temporarily prevent new signatures from being applied.

Conditions

This issue may occur when multiple bot signature overrides are configured in Bot Defense profiles. Updates that involve multiple signature overrides are more likely to trigger higher memory usage.

Workaround

Increase available TMM memory by provisioning the LTM module. Reduce the number of multiple overrides (either individual signature overrides or signature category overrides) in Bot Defense profiles, as multiple overrides significantly increase memory usage during updates.

Fix Information

The fix will optimize the bot signature update mechanism to reduce memory consumption, improve failure handling.

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips