Last Modified: Jul 18, 2026
Affected Product(s):
BIG-IP ASM
Known Affected Versions:
11.5.1, 11.5.1 hf1, 11.5.1 hf2, 11.5.1 hf3, 11.5.1 hf4, 11.5.1 hf5, 11.5.1 hf6, 11.5.1 hf7, 11.5.1 hf8, 11.5.1 hf9, 11.5.1 hf10, 11.5.1 hf11, 11.5.2, 11.5.2 hf1, 11.5.3, 11.5.3 hf1, 11.5.3 hf2, 11.5.4, 11.5.4 hf1, 11.5.4 hf2, 11.5.4 hf3, 11.5.4 hf4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10
Fixed In:
11.6.0
Opened: Jan 29, 2014 Severity: 4-Minor
ASM blocks a request where the Content-Length header value has more than 20 leading spaces.
Web application requests are getting false positive blocks.
-- ASM provisioned. -- ASM policy attached to a virtual server. -- 'Unparsable request content' sub-violation is enabled under 'HTTP protocol compliance checks' in the ASM policy.
Use an iRule that strips leading spaces from the Content-Length header value.
This release fixes an issue that sometimes might have incorrectly triggered an unparseable request violation.