CVE-2021-1236

Multiple Cisco products are affected by a vulnerability in the Snort
application detection engine that could allow an unauthenticated, remote
attacker to bypass the configured policies on an affected system. The
vulnerability is due to a flaw in the detection algorithm. An attacker
could exploit this vulnerability by sending crafted packets that would flow
through an affected system. A successful exploit could allow the attacker
to bypass the configured policies and deliver a malicious payload to the
protected network.