Last Modified: Mar 20, 2026
Affected Product(s):
BIG-IP APM
Known Affected Versions:
17.5.1.3, 17.5.1.4, 17.5.1.5
Opened: Mar 20, 2026 Severity: 3-Major
The APM Rewrite component may crash while processing JavaScript responses when Portal Access is enabled. This can result in incomplete page loads, missing UI elements, or unexpected user logouts when accessing applications through APM.
-- APM Rewrite process may crash -- Application pages may fail to load fully or correctly -- User sessions may be disrupted
-- APM Portal Access is enabled -- JavaScript rewriting is enabled in the Rewrite profile -- Backend application serves JavaScript content -- Responses are compressed and rewritten before being delivered to the client -- Issue may occur with specific JavaScript responses during processing
Disable rewrite for the JS file which causing this issue. when HTTP_REQUEST { if {[HTTP::path] ends_with "Problematic.js"} { HTTP::uri [string map {F5CH=J F5CH=I} [HTTP::uri]] } }
None