🛡️ CVE-2022-20623 — nx-os

🟠 CVSS 8.6 — High ✅ No Known Exploit CWE-399 NVD
8.6
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2022-20623 is recorded against 1 package.

  • nx-os (from 10.1\(1\) up to 10.2\(1\))

Timeline and source

Published on 23 February 2022 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

tools.cisco.com
tools.cisco.com

Details

Severity HIGH
CVSS Score 8.6
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE CWE-399
Public Exploit ✅ No
Source NVD
Published 2022-02-23
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
nx-os 10.1\(1\) 10.2\(1\)

Similar Threats

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