CVE-2021-0293 : Security Advisory and Response
Discover the details of CVE-2021-0293, a vulnerability in Juniper Networks Junos OS leading to a memory leak and potential denial of service condition. Learn about impact, affected systems, and mitigation steps.
A vulnerability in Juniper Networks Junos OS caused by Missing Release of Memory after Effective Lifetime leads to a memory leak each time the CLI command 'show system connections extensive' is executed. Find out the impact, technical details, mitigation steps, and more related to CVE-2021-0293.
Understanding CVE-2021-0293
This section provides insight into the vulnerability identified as CVE-2021-0293.
What is CVE-2021-0293?
The vulnerability found in Juniper Networks Junos OS occurs due to Missing Release of Memory after Effective Lifetime, resulting in a memory leak when executing a specific CLI command, potentially leading to an out-of-memory condition and system crashes.
The Impact of CVE-2021-0293
Executing the vulnerable CLI command can result in a memory leak that may cause daemon crashes, ultimately leading to a Denial of Service (DoS) condition due to excessive memory consumption.
Technical Details of CVE-2021-0293
Explore the technical aspects of CVE-2021-0293 below.
Vulnerability Description
The vulnerability in Junos OS allows memory leaks when running the 'show system connections extensive' command, potentially causing system-wide crashes.
Affected Systems and Versions
Juniper Networks Junos OS versions 18.2 to 20.3 are affected by this vulnerability, while versions prior to 18.2R1 remain unaffected.
Exploitation Mechanism
Juniper SIRT has not detected any malicious exploitation related to this vulnerability, providing some relief regarding potential widespread attacks.
Mitigation and Prevention
Learn how to mitigate and prevent the issues arising from CVE-2021-0293.
Immediate Steps to Take
To address the vulnerability, ensure to update Junos OS to the fixed software releases, including versions 18.2R2-S8, 18.2R3-S7, and subsequent releases.
Long-Term Security Practices
For long-term security, limit execution of the vulnerable CLI command and monitor memory consumption closely to prevent potential crashes.
Patching and Updates
Juniper Networks has released software updates to resolve the vulnerability, providing a comprehensive list of versions that address the issue. Ensure timely updates to minimize risks of exploitation.