VULNERABILITY INTELLIGENCE

CVE-2021-1591

CVSS score5.8 MEDIUM
EPSS probability1.00%
CISA KEVNot currently listed
Published2021-08-25
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Description

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.

Weakness classification

  • psirt@cisco.com: CWE-284
  • nvd@nist.gov: NVD-CWE-Other

Primary references