CVE-2021-0239CWE-754

Junos OS Evolved: Denial of Service due to receipt of specific genuine layer 2 frames.

Medium · published April 22, 2021

CVSS v3.1
6.5
EPSS
0%
Percentile
30.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00381 · 30.9th percentile
Weakness
CWE-754 · Improper Check for Unusual or Exceptional Conditions
Published
2021-04-22T19:37Z
EPSS history
Timeline
  • 22 APR 19:37Z
    Junos OS Evolved: Denial of Service due to receipt of specific genuine layer 2 frames.
    cvelistv5