Bug ID 1927225: Vertical tab (u000b) is removed from the request by the JSON parser

Last Modified: Oct 15, 2025

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

Known Affected Versions:
17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2

Fixed In:
17.5.1.2, 17.1.3

Opened: Apr 15, 2025

Severity: 3-Major

Symptoms

The JSON parser removes the vertical tab (\u00b) from the request, preventing attack signatures from matching and causing the request to be bypassed.

Impact

Attack signatures are not matched to the SQL injection attack vector.

Conditions

Attaching the JSON profile, send a request with a vertical tab (\u000b).

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips