CVE-2021-0287 : Vulnerability Insights and Analysis
Discover the details of CVE-2021-0287 affecting Junos OS and Junos OS Evolved, potentially leading to a DoS situation. Learn about the impact, affected systems, and mitigation measures.
In this article, we will explore CVE-2021-0287, which affects Junos OS and Junos OS Evolved, leading to a potential denial of service (DoS) due to a routing process daemon crash in an SR-ISIS/MPLS environment.
Understanding CVE-2021-0287
This vulnerability impacts Junos OS and Junos OS Evolved devices in specific configurations, potentially causing a DoS through RPD crashes.
What is CVE-2021-0287?
In a Segment Routing ISIS (SR-ISIS)/MPLS setup, a flap of an ISIS link can trigger a crash in the routing process daemon (RPD) on Juniper Networks devices, resulting in a DoS situation.
The Impact of CVE-2021-0287
Continued link flaps can exacerbate the DoS condition on affected Junos OS and Junos OS Evolved devices, affecting specific versions of the software.
Technical Details of CVE-2021-0287
This section delves into the specifics of the vulnerability, including the description, affected systems, versions, and exploitation mechanism.
Vulnerability Description
The vulnerability arises from the interaction of ISIS Flexible Algorithm for Segment Routing and sensor-based statistics, culminating in a potential RPD crash under certain conditions.
Affected Systems and Versions
Juniper Networks Junos OS versions 19.4 to 20.3 and Junos OS Evolved from 20.3-EVO to 20.4-EVO are susceptible, while earlier versions remain unaffected.
Exploitation Mechanism
No malicious exploitations of this vulnerability have been reported by Juniper SIRT at this time.
Mitigation and Prevention
Learn how to mitigate the risks posed by CVE-2021-0287 through immediate steps and long-term security practices.
Immediate Steps to Take
Disabling IS-IS Flexible Algorithm for Segment Routing or sensor-based statistics can help mitigate the vulnerability on affected devices.
Long-Term Security Practices
Adopting a robust patching and update strategy can ensure your systems are shielded from potential exploits in the future.
Patching and Updates
Ensure your Junos OS and Junos OS Evolved systems are updated to the recommended software versions to address CVE-2021-0287.