Bug ID 2151413: TACACS External Authentication Failure after a software upgrade

Last Modified: Jan 08, 2026

Affected Product(s):
F5OS F5OS(all modules)

Known Affected Versions:
F5OS-A 1.8.2, F5OS-A 1.8.3

Opened: Nov 12, 2025

Severity: 2-Critical

Symptoms

TACACS users are not able to login to the device.

Impact

TACACS users will be unable to log in when the server is configured under the specified conditions.

Conditions

TACACS+ server sends back an authorization reply with an auth status of 'PASS_REPL' (pass + *replace all attributes*) instead of 'PASS_ADD' (pass + *add* to attributes)

Workaround

Avoid using PASS_REPL on Tacacs server.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips