Cloud Defense Logo

Products

Solutions

Company

CVE-2021-1389 : Exploit Details and Defense Strategies

Discover the impact of CVE-2021-1389, a vulnerability in Cisco IOS XR and Cisco NX-OS Software that allows remote attackers to bypass IPv6 access control lists. Learn about mitigation and prevention strategies.

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.

Understanding CVE-2021-1389

This CVE, published on February 3, 2021, highlights a vulnerability in Cisco IOS XR and Cisco NX-OS Software that could be exploited by an attacker to bypass IPv6 access control lists.

What is CVE-2021-1389?

The vulnerability in Cisco IOS XR and Cisco NX-OS Software allows unauthenticated attackers to bypass IPv6 ACLs by sending crafted packets through the affected devices, thus accessing protected resources.

The Impact of CVE-2021-1389

If successfully exploited, this vulnerability could compromise the security of network devices and allow unauthorized access to resources typically protected by ACLs.

Technical Details of CVE-2021-1389

This vulnerability has a CVSSv3.1 base score of 5.8, indicating a medium severity level.

Vulnerability Description

Improper processing of IPv6 traffic in the affected devices enables attackers to bypass configured ACLs by sending malicious IPv6 packets.

Affected Systems and Versions

The vulnerability affects certain versions of Cisco IOS XR Software and Cisco NX-OS Software.

Exploitation Mechanism

Attackers exploit this vulnerability by crafting specific IPv6 packets that traverse the affected devices, bypassing ACLs.

Mitigation and Prevention

Following the identification of CVE-2021-1389, it is crucial to take immediate and long-term security measures to mitigate risks.

Immediate Steps to Take

Implement recommended security patches and configurations to address the vulnerability and prevent exploitation.

Long-Term Security Practices

Regularly update and monitor security configurations, apply patches promptly, and conduct thorough security assessments to prevent similar vulnerabilities.

Patching and Updates

Refer to the vendor advisory on Cisco's website for detailed information on patching and updates.

Popular CVEs

CVE Id

Published Date

Is your System Free of Underlying Vulnerabilities?
Find Out Now