CVE-2021-1136 Explained : Impact and Mitigation

This article provides an overview of CVE-2021-1136, detailing the impact, technical details, and mitigation strategies related to this vulnerability.

Understanding CVE-2021-1136

CVE-2021-1136 involves multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers and Cisco IOS XR Software for the Cisco 8000 Series Routers.

What is CVE-2021-1136?

The vulnerability allows an authenticated, local attacker to execute unsigned code during the boot process on affected devices.

The Impact of CVE-2021-1136

With a CVSS base score of 6.7, this vulnerability poses a medium severity risk with high impact on confidentiality, integrity, and availability.

Technical Details of CVE-2021-1136

This section delves into the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The vulnerability enables attackers to execute unsigned code during the boot process.

Affected Systems and Versions

Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers are impacted.

Exploitation Mechanism

An authenticated, local attacker can exploit this vulnerability.

Mitigation and Prevention

Explore the immediate steps to take and long-term security practices to safeguard your systems.

Immediate Steps to Take

Ensure authorized access controls and monitor system boot process for any unauthorized code execution.

Long-Term Security Practices

Regularly update systems with security patches and conduct security audits to detect any vulnerabilities.

Patching and Updates

Stay informed about security updates from Cisco and promptly apply patches to mitigate the risk of exploitation.