Last Modified: Sep 13, 2023
Known Affected Versions:
15.1.4, 126.96.36.199, 15.1.5, 188.8.131.52, 15.1.6, 184.108.40.206, 15.1.7, 15.1.8, 220.127.116.11, 18.104.22.168, 15.1.9, 22.214.171.124
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
An NXDOMAIN flood attack can be detected and mitigated when DNS cache is enabled.