CVE-2021-0239 Information

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.

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://kb.juniper.net/JSA11134

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5