Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP AFM
Known Affected Versions:
15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1
Fixed In:
15.1.10
Opened: Apr 05, 2022 Severity: 4-Minor
When the DNS cache is activated, the NXDOMAIN DoS vector does not increase for the virtual server context. As a result, NXDOMAIN flood attack is never detected/mitigated at the virtual server context. At the device level, NXDOMAIN stats are incorrect.
NXDOMAIN flood attack is not detected/mitigated at the virtual server context.
-- DNS cache is activated -- An NXDOMAIN DoS vector occurs
None
An NXDOMAIN flood attack can be detected and mitigated when DNS cache is enabled.