Improper access control in Cisco NX-OS and Cisco Nexus 9500 Series - CVE-2021-1591
Published: August 26, 2021
Vulnerability identifier: #VU56104
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-1591
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to oversubscription of resources that occurs when applying ACLs to port channel interfaces. A remote attacker can access network resources that would be protected by the ACL that was applied on the port channel interface.
Affected software
Cisco NX-OS
Cisco Nexus 9500 Series
Cisco Nexus 9500 Series
How to mitigate CVE-2021-1591
Install updates from vendor's website.
Cisco Nexus 9500 Series - addressed in versions 7.0.3 I7.9.8, 7.0.3 I7.9 SMU.14, 7.0.3 I7.10, 9.3.4 SMU.98, 9.3.7a, 9.3.7a.8, 9.3.7 SMU.21, 9.3.7 SMU.26, 9.3.7.7, 9.3.8, 10.1.1.90, 10.1.2