CVE-2021-0250 : What You Need to Know

A vulnerability in Juniper Networks Junos OS and Junos OS Evolved could allow an attacker to crash the RPD service, leading to a Denial of Service (DoS) condition. This CVE record was published on April 14, 2021.

Understanding CVE-2021-0250

This CVE affects Juniper Networks Junos OS and Junos OS Evolved, impacting specific versions and configurations.

What is CVE-2021-0250?

The vulnerability involves a crafted BGP update message that can crash the Routing Protocol Daemon (RPD) process, creating a DoS condition in SRTE environments with BGP Monitoring Protocol enabled.

The Impact of CVE-2021-0250

The vulnerability has a CVSS base score of 7.5 (High) with low attack complexity and network vector, resulting in a high availability impact.

Technical Details of CVE-2021-0250

This section covers the vulnerability description, affected systems, versions, and exploitation mechanisms.

Vulnerability Description

A specific crafted BGP update message in SRTE environments with BMP enabled can crash the RPD service, leading to a sustained DoS condition.

Affected Systems and Versions

Juniper Networks Junos OS versions from 17.4R1 to 19.2 and Junos OS Evolved 19.2-EVO are affected by this vulnerability.

Exploitation Mechanism

There have been no reported malicious exploits leveraging this vulnerability.

Mitigation and Prevention

Understanding immediate steps, long-term security practices, and the availability of patches and updates is crucial.

Immediate Steps to Take

Disable the BGP monitoring protocol until the software releases are updated to resolve the issue.

Long-Term Security Practices

Regularly monitor security advisories and ensure timely software updates to mitigate future vulnerabilities.

Patching and Updates

Juniper Networks has released updated software versions to address this vulnerability across impacted releases and subsequent versions.