Bug ID 726377: False-positive cookie hijacking violation

Last Modified: Oct 07, 2023

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

Known Affected Versions:
13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,

Fixed In:
15.0.0, 14.1.0, 14.0.0,

Opened: Jul 01, 2018

Severity: 3-Major


A false-positive cookie hijacking violation.


False positive violation / blocking.


-- Several sites are configured on the policy, without subdomains. -- TS cookies are sent with the higher domain level then the configured. -- A single cookie from another host (that belongs to the same policy) arrives and is mistaken as the other site cookie.


Cookie hijacking violation when the device ID feature is turned off is almost never relevant, as it should be able to detect only cases where some of the TS cookies were taken. The suggestion is to turn off this violation.

Fix Information

False-positive cookie hijacking violation no longer happens working with multiple domains on some scenarios.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips