Bug ID 854001: TMM might crash in case of trusted bot signature and API protected url

Last Modified: Sep 13, 2023

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 16.0.0,, 16.0.1,

Fixed In:
16.1.0,, 15.1.4,

Opened: Nov 28, 2019

Severity: 2-Critical


When sending request to a protected API URL, with a trusted bot signature, tmm tries to perform reverse DNS to verify the signature. During this process, the URL qualification might change. In this case - tmm crashes.


Traffic disrupted while tmm restarts.


-- Bot Defense profile attached. -- 'API Access for Browsers and Mobile Applications' is enabled. -- A DNS server is configured. -- Request is sent to an API-qualified URL. -- Request is sent with a trusted bot signature.


Disable the 'API Access for Browsers and Mobile Applications' or remove the DNS server.

Fix Information

An issue where tmm could crash when processing a request sent to a protected API URL with a trusted bot signature has been fixed.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips