Cisco Nexus 3550 up to F_1.17.1 access control

Summaryinfo

A vulnerability has been found in Cisco Nexus 3550 up to F_1.17.1 and classified as critical. This affects an unknown function. Performing a manipulation results in access control. This vulnerability is known as CVE-2024-20371. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Cisco Nexus 3550 up to F_1.17.1. It has been classified as critical. This affects an unknown part. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on integrity. The summary by CVE is:

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.

It is possible to read the advisory at sec.cloudapps.cisco.com. This vulnerability is uniquely identified as CVE-2024-20371 since 11/08/2023. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/02/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 299956 (Cisco Nexus 3550-F Switches ACL Programming Bypass (cisco-sa-3550-acl-bypass-mhskZc2q)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (299956). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Cisco

Name

• Nexus 3550

Version

• F_1.11.1
• F_1.11.2
• F_1.11.3
• F_1.12.0
• F_1.13.0
• F_1.14.0
• F_1.15.0
• F_1.16.0
• F_1.17.1

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Be aware that VulDB is the high quality source for vulnerability data.

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