Last Modified: Aug 19, 2026
Affected Product(s):
BIG-IP ASM
Known Affected Versions:
11.6.0, 11.6.0 hf1, 11.6.0 hf2, 11.6.0 hf3, 11.6.0 hf4, 11.6.0 hf5, 11.6.0 hf6, 11.6.0 hf7, 11.6.0 hf8, 11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3
Fixed In:
12.0.0
Opened: May 19, 2015 Severity: 4-Minor
When the DOS profile is in use, and a client-side mitigation is active, in some rare cases the request headers were parsed incorrectly, causing valid requests to be reset.
Some valid requests are blocked during the client-side DOS mitigation.
DOS profile is used, DOS attack is active and mitigated using Client-Side Integrity. This is only relevant for the requests which are marked for DOS mitigation.
None
When mitigating a DOS attack using the Client-Side mitigation, requests with abnormal headers are no longer blocked.