Bug ID 421356: Some specially formatted links in the HTML page may cause crash of rewrite process

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.2.1, 11.3.0, 11.4.0

Fixed In:
11.5.0, 11.4.1, 11.4.0 HF6, 11.3.0 HF6, 11.2.1 HF8

Opened: May 17, 2013
Severity: 3-Major
Related AskF5 Article:


The BIG-IP APM rewrite process may exit and restart when processing uniform resource identifiers (URI) with multiple doubledot (..) characters. As a result of this issue, you may encounter one or more of the following symptoms: -- APM end user requests for portal access resources stall or fail. -- The system generates a rewrite process core file to the /shared/core directory.


The BIG-IP APM system may temporarily fail to process traffic while the system recovers from the rewrite process restarting.


This issue occurs when all of the following conditions are met: -- The BIG-IP APM system is configured for portal access. -- The BIG-IP APM system processes a URI that contains multiple doubledot characters. For example, the following HTML links may cause the rewrite process to exit and restart: <a href="../../../../../../../../../../index.html"/> <a href="xxx/../../../../../../../../../../index.html"/>


This issue has no workaround at this time.

Fix Information

A rewrite plugin crash that could happen when accessing some HTML pages through APM portal access no longer occurs.

Behavior Change