CVE-2023-20169: high-severity vulnerability in Cisco NX-OS Software
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 0.3%
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.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
Cisco · Cisco NX-OS SoftwareRelated CVEs — Cisco NX-OS Software
In the same product, most dangerous first.
CVE-2024-20399MEDIUMCisco NX-OS Software CLI Command Injection VulnerabilityEPSS 4.3%KEVCVE-2022-20650HIGHCisco NX-OS Software NX-API Command Injection VulnerabilityEPSS 14.5%CVE-2022-20624HIGHCisco NX-OS Software Cisco Fabric Services Over IP Denial of Service VulnerabilityEPSS 12.4%CVE-2022-20623HIGHCisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service VulnerabilityEPSS 11.9%CVE-2026-76455CRITICALCisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control VulnerabilitiesEPSS 3.6%CVE-2022-20625MEDIUMCisco FXOS and NX-OS Software Cisco Discovery Protocol Service Denial of Service VulnerabilityEPSS 3.3%