CVE-2021-0291 Explained : Impact and Mitigation
Learn about CVE-2021-0291, an Exposure of System Data vulnerability in Juniper Networks Junos OS and Junos OS Evolved. Find out the impact, affected systems and versions, exploitation mechanism, and mitigation steps.
This article provides details about the CVE-2021-0291 vulnerability in Junos OS and Junos OS Evolved, along with its impact, technical details, mitigation steps, and more.
Understanding CVE-2021-0291
This section discusses the vulnerability identified as CVE-2021-0291 in Junos OS and Junos OS Evolved.
What is CVE-2021-0291?
CVE-2021-0291 is an Exposure of System Data vulnerability in Juniper Networks Junos OS and Junos OS Evolved. An attacker can cause a partial Denial of Service (DoS) by sending specific traffic to a sensitive system-level resource.
The Impact of CVE-2021-0291
The vulnerability allows a network-based unauthenticated attacker to increase CPU utilization, potentially leading to a partial DoS situation. It affects various versions of Junos OS and Junos OS Evolved.
Technical Details of CVE-2021-0291
This section covers the vulnerability description, affected systems, versions, and exploitation mechanism.
Vulnerability Description
The vulnerability exposes a system resource in Junos OS and Junos OS Evolved to unauthenticated network-based attacks, impacting CPU utilization and potentially causing a partial DoS.
Affected Systems and Versions
Junos OS versions ranging from 15.1 to 20.3 and Junos OS Evolved prior to 20.3R2-EVO are affected by this vulnerability.
Exploitation Mechanism
The attacker can send specific traffic to exploit the vulnerability, leading to increased CPU usage and potential DoS incidents.
Mitigation and Prevention
This section provides information on mitigating the CVE-2021-0291 vulnerability.
Immediate Steps to Take
Users are advised to apply the provided software updates for Junos OS and Junos OS Evolved to address the vulnerability and prevent exploitation.
Long-Term Security Practices
Implement access lists or firewall filters to restrict access to TCP port 705, enhancing network security.
Patching and Updates
Juniper Networks has released software updates for various affected versions of Junos OS and Junos OS Evolved to resolve the vulnerability.