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

Last Modified: Aug 05, 2025

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

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

When sending TCP packets with both the SYN and ACK flags enabled (SYN/ACK packets), the TCP ACK vector statistics do not increase.

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips