How severe is CVE-2021-0239?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 6.5 out of 10.

What type of vulnerability is CVE-2021-0239?

This is classified as CWE-754, which is a common weakness in software security.

CVE-2021-0239 - MEDIUM Severity | CVSS 6.5

Vulnerability Description

In Juniper Networks Junos OS Evolved, receipt of a stream of specific genuine Layer 2 frames may cause the Advanced Forwarding Toolkit (AFT) manager process (Evo-aftmand), responsible for handling Route, Class-of-Service (CoS), Firewall operations within the packet forwarding engine (PFE) to crash and restart, leading to a Denial of Service (DoS) condition. By continuously sending this specific stream of genuine Layer 2 frames, an attacker can repeatedly crash the PFE, causing a sustained Denial of Service (DoS). This issue affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R1-EVO. This issue does not affect Junos OS versions.

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