K50233772 : HTTP/2 Settings Flood vulnerability CVE-2019-9515

Security Advisory Description

Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both. (CVE-2019-9515)

Impact

The BIG-IP system may exhaust available resources and fail over to another system in the device group.