Bug ID 1051213: Increase default value for violation 'Check maximum number of headers'.

Last Modified: Feb 07, 2024

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

Known Affected Versions:
12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5, 16.1.0, 16.1.1, 16.1.2,

Fixed In:
17.0.0,,,, 13.1.5

Opened: Sep 30, 2021

Severity: 3-Major


Due to recent change in browsers, up to 7 headers are newly inserted in the request. In ASM, there is default limit of 20 headers. So, when legitimate requests have more than 20 headers, they're blocked with violation "Maximum Number of Headers exceeded".


Legitimate requests are blocked with violation "Maximum Number of Headers exceeded" when number of header is greater than the value set for the policy (default 20).


When the number of headers passed in request is greater than the value of maximum number of headers set, then this violation is raised.


Increase "Check maximum number of headers" to 30 under Learning and Blocking settings screen for a policy.

Fix Information

Increased default value of maximum number of headers to 30.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips