Skip to content
fr Sign in
5.8 Medium

CVE-2021-1389 A vulnerability in the IPv6 traffic processing of Cisco IOS XR Software and Cisco NX-OS Software for certain Cisco…

Description

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.

Affected products and versions

Product Affected versions Fixed in
Cisco IOS XR Software Versions not published

References

Timeline

  1. Published
  2. Last modified

Other CVEs of Cisco IOS XR Software

The 115 CVEs of Cisco IOS XR Software →
CVE-2026-76505 A vulnerability in the IPv4 packet processing functionality of Cisco IOS XR Software that affects Cisco ASR 9000 and… 7.5 High CVE-2026-20278 As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering… 8.8 High CVE-2026-20280 As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software… 8.8 High CVE-2026-20279 As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering… 9.8 Critical
Track this CVE