CVE-2022-20623: Cisco NX-OS

High severity, CVSS 7.5. EPSS: 11.9% chance of exploitation in the next 30 days.

A vulnerability in the rate limiter for Bidirectional Forwarding Detection (BFD) traffic of Cisco NX-OS Software for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to cause BFD traffic to be dropped on an affected device. This vulnerability is due to a logic error in the BFD rate limiter functionality. An attacker could exploit this vulnerability by sending a crafted stream of traffic through the device. A successful exploit could allow the attacker to cause BFD traffic to be dropped, resulting in BFD session flaps. BFD session flaps can cause route instability and dropped traffic, resulting in a denial of service (DoS) condition. This vulnerability applies to both IPv4 and IPv6 traffic.

Affected products

• Cisco NX-OS: from 7.0\(3\)i6\(2\), up to and including 7.0\(3\)i7\(3\); from 7.0\(3\)i6\(2\), up to and including 9.3\(8\); from 10.1\(1\), up to and including 10.2\(1\)

Published 2022-02-23. Last modified 2026-06-17.