CVE-2021-1389 MEDIUM

CVE-2021-1389: Cisco IOS XR and Cisco NX-OS Software IPv6 Access Control List Bypass Vulnerability

Vendor Cisco
Product Cisco IOS XR Software
Weakness CWE-284
Published February 4, 2021
Last update November 8, 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 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.

Key dates

02Disclosure timeline

February 4, 2021 CVE published
November 8, 2024 Record updated