CVE-2021-34771 Explained : Impact and Mitigation

A vulnerability in the Cisco IOS XR Software CLI could allow an authenticated, local attacker to view more information than their privileges allow. This article delves into the details of CVE-2021-34771, its impact, technical details, and mitigation strategies.

Understanding CVE-2021-20657

This section covers the essential aspects of the Cisco IOS XR Software Unauthorized Information Disclosure Vulnerability.

What is CVE-2021-20657?

The vulnerability in Cisco IOS XR Software CLI allows a local attacker to view restricted information by executing a specific command. Due to inadequate restrictions during command execution, the attacker can access sensitive configuration data beyond their privileges.

The Impact of CVE-2021-20657

The vulnerability poses a medium severity risk with a CVSS base score of 5.5. It allows attackers to potentially breach confidentiality by accessing sensitive data without proper authorization.

Technical Details of CVE-2021-20657

This section delves into the technical specifics of the vulnerability.

Vulnerability Description

The flaw arises from the lack of proper restrictions while executing certain commands within Cisco IOS XR Software CLI. Attackers can exploit this weakness to gain unauthorized access to confidential configuration information.

Affected Systems and Versions

The vulnerability impacts all versions of Cisco IOS XR Software.

Exploitation Mechanism

Attackers with local authenticated access can exploit this vulnerability by running a specific command, bypassing restrictions to view confidential data.

Mitigation and Prevention

Discover the steps to mitigate the risks associated with CVE-2021-20657.

Immediate Steps to Take

Users are advised to apply security updates as soon as patches are available. Additionally, restrict access to sensitive information to minimize the threat.

Long-Term Security Practices

Implement a least privilege approach, ensuring users have minimal access necessary for their roles. Regular security audits and monitoring can also help detect any unauthorized activities.

Patching and Updates

Stay updated with security advisories from Cisco and promptly apply patches to safeguard systems against potential threats.