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CVE-2021-0292 : Vulnerability Insights and Analysis

Learn about CVE-2021-0292, a memory leak vulnerability in Juniper Networks Junos OS Evolved leading to Denial of Service. Find out the impact, affected systems, and mitigation steps.

An in-depth look at the Uncontrolled Resource Consumption vulnerability in the ARP daemon (arpd) and Network Discovery Protocol (ndp) process of Juniper Networks Junos OS Evolved, its impact, technical details, and mitigation steps.

Understanding CVE-2021-0292

This CVE addresses a memory leak issue in arpd or ndp processes in Juniper Networks Junos OS Evolved, potentially leading to a Denial of Service (DoS) attack.

What is CVE-2021-0292?

The vulnerability allows a malicious local attacker to consume memory resources, affecting link-layer functions like address resolution, leading to traffic loss.

The Impact of CVE-2021-0292

The DoS condition caused by this vulnerability requires manual intervention to restart the affected processes, impacting network availability and performance.

Technical Details of CVE-2021-0292

The vulnerability resides in the ARP daemon (arpd) and Network Discovery Protocol (ndp) process of Junos OS Evolved, affecting specific versions.

Vulnerability Description

Memory consumption by the arpd or ndp processes can exhaust resources, causing network disruptions and potential service unavailability.

Affected Systems and Versions

Junos OS Evolved versions 19.4R2-S3-EVO, 20.1R2-S4-EVO, and all versions of 20.2-EVO are affected by this vulnerability.

Exploitation Mechanism

Juniper SIRT has not observed any malicious exploitation leveraging this vulnerability.

Mitigation and Prevention

To address CVE-2021-0292, Juniper Networks recommends updating to the following fixed software releases: Junos OS Evolved 19.4R2-S3-EVO, 20.1R2-S4-EVO, 20.3R1-EVO, or later.

Immediate Steps to Take

Users are advised to apply the recommended software updates promptly to mitigate the risk of exploitation.

Long-Term Security Practices

Regularly updating network infrastructure software is crucial to prevent potential vulnerabilities and ensure system security.

Patching and Updates

Stay informed about security advisories from Juniper Networks and apply patches promptly to maintain a secure environment.

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