What is the vulnerability ID for this vulnerability?

The vulnerability ID for this vulnerability is CVE-2022-20623.

What is the severity of CVE-2022-20623?

The severity of CVE-2022-20623 is high, with a severity value of 7.5.

Which Cisco products are affected by CVE-2022-20623?

Cisco NX-OS Software for Cisco Nexus 9000 Series Switches is affected by CVE-2022-20623.

How can an attacker exploit this vulnerability?

An unauthenticated, remote attacker can exploit this vulnerability to cause BFD traffic to be dropped on an affected device.

Is there a fix available for CVE-2022-20623?

Yes, Cisco has released a security advisory with mitigation details for CVE-2022-20623. Please refer to the advisory for more information.

Vulnerability/
CVE-2022-20623

high

8.6

CWE

399

23/2/2022

17/9/2024

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

First published: Wed Feb 23 2022(Updated: )

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.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco Nx-os	>=7.0\(3\)i6\(2\)<=7.0\(3\)i7\(3\)
Cisco N9k-c92160yc-x
Cisco N9k-c92300yc
Cisco N9k-c92304qc
Cisco N9k-c9232c
Cisco N9k-c92348gc-x
Cisco N9k-c9236c
Cisco N9k-c9272q
Cisco N9k-c93108tc-ex
Cisco N9k-c93108tc-fx
Cisco N9k-c9316d-gx
Cisco N9k-c93180lc-ex
Cisco N9k-c93180yc-ex
Cisco N9k-c93180yc-fx
Cisco N9k-c93180yc2-fx
Cisco N9k-c93216tc-fx2
Cisco N9k-c93240yc-fx2
Cisco N9k-c9332c
Cisco N9k-c93360yc-fx2
Cisco N9k-c9336c-fx2
Cisco N9k-c9348gc-fxp
Cisco N9k-c93600cd-gx
Cisco N9k-c9364c
Cisco N9k-c9364c-gx
Cisco Nx-os	>=7.0\(3\)i6\(2\)<=9.3\(8\)
Cisco Nx-os	>=10.1\(1\)<=10.2\(1\)
Cisco N9k-x97160yc-ex
Cisco N9k-x97284yc-fx
Cisco N9k-x9732c-ex
Cisco N9k-x9732c-fx
Cisco N9k-x9736c-ex
Cisco N9k-x9736c-fx
Cisco N9k-x9788tc-fx

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-bfd-dos-wGQXrzxn

Frequently Asked Questions

What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2022-20623.
What is the severity of CVE-2022-20623?
The severity of CVE-2022-20623 is high, with a severity value of 7.5.
Which Cisco products are affected by CVE-2022-20623?
Cisco NX-OS Software for Cisco Nexus 9000 Series Switches is affected by CVE-2022-20623.
How can an attacker exploit this vulnerability?
An unauthenticated, remote attacker can exploit this vulnerability to cause BFD traffic to be dropped on an affected device.
Is there a fix available for CVE-2022-20623?
Yes, Cisco has released a security advisory with mitigation details for CVE-2022-20623. Please refer to the advisory for more information.