CVE-2022-20623 Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability
Remote attackers can cause denial of service on Cisco Nexus switches by triggering BFD session flaps via crafted traffic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-20623?
CVE-2022-20623 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 23 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-399
Which versions are affected by CVE-2022-20623?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2022-20623?
No fix has been published for CVE-2022-20623 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-20623 being exploited?
There is no known exploitation of CVE-2022-20623 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-p4xm-j739-93q3.