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Cisco NX-OS: CVE-2023-20169: Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol Denial of Service Vulnerability

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Cisco NX-OS: CVE-2023-20169: Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol Denial of Service Vulnerability

Severity
6
CVSS
(AV:A/AC:L/Au:N/C:N/I:N/A:C)
Published
08/23/2023
Created
08/24/2023
Added
08/24/2023
Modified
07/16/2024

Description

A vulnerability in the Intermediate System-to-Intermediate System (IS-IS) protocol of Cisco NX-OS Software for the Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the IS-IS process to unexpectedly restart, which could cause an affected device to reload. This vulnerability is due to insufficient input validation when parsing an ingress IS-IS packet. An attacker could exploit this vulnerability by sending a crafted IS-IS packet to an affected device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition due to the unexpected restart of the IS-IS process, which could cause the affected device to reload. Note: The IS-IS protocol is a routing protocol. To exploit this vulnerability, an attacker must be Layer 2 adjacent to the affected device.

Solution(s)

  • cisco-nx-update-latest

References

  • https://attackerkb.com/topics/cve-2023-20169
  • CVE - 2023-20169
  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-n3_9k-isis-dos-FTCXB4Vb
  • cisco-sa-nxos-n3_9k-isis-dos-FTCXB4Vb
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