BugZero | Cisco BugID CSCvx75912 - Cisco Nexus 9000 Series Bidirectional Forwarding D...

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BugZero | Cisco BugID CSCvx75912 - Cisco Nexus 9000 Series Bidirectional Forwarding D...

ODD
Cisco
CSCvx75912

Cisco - Defect ID: CSCvx75912

Cisco Nexus 9000 Series Bidirectional Forwarding Detection Denial of Service Vulnerability

ODD
Cisco
CSCvx75912

Cisco - Defect ID: CSCvx75912

Cisco Nexus 9000 Series Bidirectional Forwarding Detection Denial of Service Vulnerability

Last updated on May 14th, 2026

BugZero Risk Score
6.1 Medium

Overall: 6.1

Severity: 6.4

Lifecycle: 9.1

Popularity: 5.1

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Bug Details

Description

Symptom

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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-bfd-dos-wGQXrzxn The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

Conditions

Please refer to the Security Advisory.

Workaround

Please refer to the Security Advisory.

Further Problem Description

Please refer to the Security Advisory.

PSIRT Evaluation

The Cisco PSIRT has assigned this bug the following CVSS version 3 score. The Base CVSS score as of the time of evaluation is 8.6: https://tools.cisco.com/security/center/cvssCalculator.x?vector=CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H CVE ID CVE-2022-20623 has been assigned to document this issue. Additional information on Cisco's security vulnerability policy can be found at the following URL: https://tools.cisco.com/security/center/resources/security_vulnerability_policy.html

Change history

2025-12-19 Added: 10.1(1), 10.1(2), 10.2(1), 10.2(1q), 10.2(2), 7.0(3)I6(2), 7.0(3)I7(1), 7.0(3)I7(10), 7.0(3)I7(2), 7.0(3)I7(3), 7.0(3)I7(4), 7.0(3)I7(5), 7.0(3)I7(5a), 7.0(3)I7(6), 7.0(3)I7(7), 7.0(3)I7(8), 7.0(3)I7(9), 9.2(1), 9.2(2), 9.2(3), 9.2(4), 9.3(1), 9.3(2), 9.3(3), 9.3(4), 9.3(5), 9.3(6), 9.3(7), 9.3(7a), 9.3(8)

Relevant Products

Click on a version to see all relevant bugs

Affected versions:10.1(1), 10.1(2), 10.2(1), 10.2(1q), 10.2(2), 7.0(3)I6(2), 7.0(3)I7(1), 7.0(3)I7(10), 7.0(3)I7(2), 7.0(3)I7(3), 7.0(3)I7(4), 7.0(3)I7(5), 7.0(3)I7(5a), 7.0(3)I7(6), 7.0(3)I7(7), 7.0(3)I7(8), 7.0(3)I7(9), 9.2(1), 9.2(2), 9.2(3), 9.2(4), 9.3(1), 9.3(2), 9.3(3), 9.3(4), 9.3(5), 9.3(6), 9.3(7), 9.3(7a), 9.3(8)

Fixed versions: 10.2(3), 10.2(4), 10.2(5), 10.2(6), 10.2(7), 10.2(8), 10.2(9), 10.3(1), 10.3(2), 10.3(3), 10.3(4a), 10.3(5), 10.3(6), 10.3(7), 10.3(8), 10.3(9), 10.4(1), 10.4(2), 10.4(3), 10.4(4), 10.4(5), 10.4(6), 10.4(7), 10.5(1), 10.5(2), 10.5(3), 10.5(3s), 10.5(4), 10.5(5), 10.6(1), 10.6(1s), 10.6(2), 10.6(2n), 10.6(3), 9.3(10), 9.3(11), 9.3(12), 9.3(13), 9.3(14), 9.3(15), 9.3(16), 9.3(9)

Relevant Products

Click on a version to see all relevant bugs

Affected versions:10.1(1), 10.1(2), 10.2(1), 10.2(1q), 10.2(2), 7.0(3)I6(2), 7.0(3)I7(1), 7.0(3)I7(10), 7.0(3)I7(2), 7.0(3)I7(3), 7.0(3)I7(4), 7.0(3)I7(5), 7.0(3)I7(5a), 7.0(3)I7(6), 7.0(3)I7(7), 7.0(3)I7(8), 7.0(3)I7(9), 9.2(1), 9.2(2), 9.2(3), 9.2(4), 9.3(1), 9.3(2), 9.3(3), 9.3(4), 9.3(5), 9.3(6), 9.3(7), 9.3(7a), 9.3(8)

Fixed versions: 10.2(3), 10.2(4), 10.2(5), 10.2(6), 10.2(7), 10.2(8), 10.2(9), 10.3(1), 10.3(2), 10.3(3), 10.3(4a), 10.3(5), 10.3(6), 10.3(7), 10.3(8), 10.3(9), 10.4(1), 10.4(2), 10.4(3), 10.4(4), 10.4(5), 10.4(6), 10.4(7), 10.5(1), 10.5(2), 10.5(3), 10.5(3s), 10.5(4), 10.5(5), 10.6(1), 10.6(1s), 10.6(2), 10.6(2n), 10.6(3), 9.3(10), 9.3(11), 9.3(12), 9.3(13), 9.3(14), 9.3(15), 9.3(16), 9.3(9)

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