Bug ID 514636: SWG Category Lookup using Subject.CN results in a crash if the certificate presented does not have a Subject.CN.

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP SWG(all modules)

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5

Opened: Mar 26, 2015
Severity: 3-Major
Related AskF5 Article:


When accessing HTTPS websites (via SWG) that present a certificate without a CN in the subject, a TMM crash occurs.


Traffic disrupted while tmm restarts.


SWG explicit or transparent proxy using Category Lookup in the per-request access policy with Subject.CN as input. The crash only happens when accessing a site that has no CN in the Certificate's subject - this is not a common condition.


Use Category lookup with SNI as input.

Fix Information

When Category Lookup is configured to use Subject.CN as input, if the certificate subject does not contain a CN, APM processes the error correctly by logging an error.

Behavior Change