CVE-2021-1389CWE-284

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

Medium · published February 4, 2021

CVSS v3.1
5.8
EPSS
1%
Percentile
68.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.01222 · 68.5th percentile
Weakness
CWE-284 · Improper Access Control
Published
2021-02-04T16:40Z
EPSS history
Timeline
  • 04 FEB 16:40Z
    Cisco IOS XR and Cisco NX-OS Software IPv6 Access Control List Bypass Vulnerability
    cvelistv5