Cisco Security Advisory - Cisco IOS XR and Cisco NX-OS Software IPv6 Access Control List Bypass Vulnerability

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Cisco IOS XR and Cisco NX-OS Software IPv6 Access Control List Bypass Vulnerability

A vulnerability in the IPv6 traffic processing of Cisco IOS XR Software and Cisco NX-OS Software for certain Cisco devices could allow an unauthenticated, remote attacker to bypass an IPv6 access control list (ACL) that is configured for an interface of an affected device.

The vulnerability is due to improper processing of IPv6 traffic that is sent through an affected device. An attacker could exploit this vulnerability by sending crafted IPv6 packets that traverse the affected device. A successful exploit could allow the attacker to access resources that would typically be protected by the interface ACL.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipv6-acl-CHgdYk8j

     
         
Security Impact Rating:  Medium
   
   
       
CVE: CVE-2021-1389
Source: Cisco IOS XR and Cisco NX-OS Software IPv6 Access Control List Bypass Vulnerability