Vulnerable Assets Library

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Audit Level: Tactical

Records optimised: 14.09.2026 10:55 UTC

CVE-2021-1591 — Cisco: Cisco NX-OS Software

Published: 2021-08-25 | Updated: 2024-11-07

MEDIUM 5.8

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.

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

NVD Record ↗ | Vendor Advisory / Fix ↗

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Disclaimer & Methodology

The Marine OT Vulnerable Assets Library is a curated repository of security advisories identified through automated heuristic filtering. Users should verify hardware revisions with manufacturers before patching.