CVE-2022-20623

Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability

HIGH

7.5

CVSS Score

Published: February 23, 2022 at 05:40 PM UTC

Updated: June 17, 2026 at 04:24 AM UTC

31 products affected across 1 vendorNx OSN9K-X9732C-ExN9K-X9736C-Fx

Using Cisco NX-OS Software by Cisco?

Get instant alerts when new vulnerabilities affect Cisco NX-OS Software - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.5

Exploit prediction

EPSS 12%

SSVC

No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nx OS · Cisconpm

95%

10.1(1) ≤ v ≤ 10.2(1)7.0(3)i6(2) ≤ v ≤ 7.0(3)i7(3)7.0(3)i6(2) ≤ v ≤ 9.3(8)

cisco-n9k-c92160yc-x (environment) · cisco-n9k-c92300yc (environment) · cisco-n9k-c92304qc (environment) · cisco-n9k-c9232c (environment) · cisco-n9k-c92348gc-x (environment) · cisco-n9k-c9236c (environment) · cisco-n9k-c9272q (environment) · cisco-n9k-c93108tc-ex (environment) · cisco-n9k-c93108tc-fx (environment) · cisco-n9k-c9316d-gx (environment) · cisco-n9k-c93180lc-ex (environment) · cisco-n9k-c93180yc-ex (environment) · cisco-n9k-c93180yc-fx (environment) · cisco-n9k-c93180yc2-fx (environment) · cisco-n9k-c93216tc-fx2 (environment) · cisco-n9k-c93240yc-fx2 (environment) · cisco-n9k-c9332c (environment) · cisco-n9k-c93360yc-fx2 (environment) · cisco-n9k-c9336c-fx2 (environment) · cisco-n9k-c9348gc-fxp (environment) · cisco-n9k-c93600cd-gx (environment) · cisco-n9k-c9364c (environment) · cisco-n9k-c9364c-gx (environment) · cisco-n9k-x97160yc-ex (environment) · cisco-n9k-x97284yc-fx (environment) · cisco-n9k-x9732c-ex (environment) · cisco-n9k-x9732c-fx (environment) · cisco-n9k-x9736c-ex (environment) · cisco-n9k-x9736c-fx (environment) · cisco-n9k-x9788tc-fx (environment)

N9K-C92160Yc-X · Ciscodevice

80%

All versions

N9K-C92300Yc · Ciscodevice

80%

All versions

N9K-C92304Qc · Ciscodevice

80%

All versions

N9K-C9232C · Ciscodevice

80%

All versions