Vulnerability · Published Feb 23, 2022 · Assigned by cisco

CVE-2022-20623Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability

High 8.6

In plain English

A high-severity security flaw in Cisco NX-OS Software from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 11.9% (higher than 96% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)11.9%top 3.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 products (as reported)

Vendor	Product	Versions
Cisco	Cisco NX-OS Software	n/a

Weakness: CWE-399 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

20220223 Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO