Bug ID 2008605: TCP ACK vector does not increase for ACK/SYN packets

Last Modified: Sep 23, 2026

Affected Product(s):
BIG-IP AFM(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, 17.1.3, 17.1.3.1, 17.1.3.2, 17.1.3.4, 17.1.3.5

Opened: Aug 05, 2025

Severity: 4-Minor

Symptoms

The TCP ACK vector dpes not accurately reflect all packets that contain the ACK flag, leading to incomplete or misleading DoS vector statistics.

Impact

Relevant traffic is not being included in the expected statistics. Incomplete DoS vector statistics.

Conditions

Relevant traffic is not being included in the expected statistics. Incomplete DoS vector statistics.

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips