Bug ID 2201693: Empty Detected Value Length for Parameters with Empty Values

Last Modified: May 05, 2026

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

Fixed In:
17.5.1.6, 17.1.3.2

Opened: Jan 14, 2026

Severity: 4-Minor

Symptoms

When a request contains a parameter with a zero-length value, the system fails to recognize it as having zero length and instead displays the parameter as having an empty value.

Impact

GUI displays parameter length with an empty value when the parameter has zero length

Conditions

Using GUI with "Illegal parameter value length" violation

Workaround

Modify checking the parameter length also for zero length

Fix Information

Modified the condition logic to use <= instead of < when comparing parameter lengths, ensuring zero-length values are correctly set

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips