CVE-2021-1591 MEDIUM

CVE-2021-1591: Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability

Vendor Cisco
Product Cisco NX-OS Software
Weakness CWE-284
Published August 25, 2021
Last update November 7, 2024
View on NVD All CVEs

CVSS base score

5.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

What the vulnerability does

01Description

A vulnerability in the EtherChannel port subscription logic of Cisco Nexus 9500 Series Switches could allow an unauthenticated, remote attacker to bypass access control list (ACL) rules that are configured on an affected device. This vulnerability is due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. An attacker could exploit this vulnerability by attempting to access network resources that are protected by the ACL. A successful exploit could allow the attacker to access network resources that would be protected by the ACL that was applied on the port channel interface.

Key dates

02Disclosure timeline

August 25, 2021 CVE published
November 7, 2024 Record updated