CVE detail

CVE-2021-0233 — CVE-2021-0233

Published 2021-04-22 · Modified 2026-06-17 · Vendor juniper · Product junos · Source nvd

HIGH

severity

CVSS-derived band

7.5

CVSS v3

0–10 scale

0.0096

EPSS probability

exploitation probability, 30d

58.0%

EPSS percentile

percentile vs all CVEs

NOT LISTED

CISA KEV

known exploited catalog

Description

A vulnerability in Juniper Networks Junos OS ACX500 Series, ACX4000 Series, may allow an attacker to cause a Denial of Service (DoS) by sending a high rate of specific packets to the device, resulting in a Forwarding Engine Board (FFEB) crash. Continued receipt of these packets will sustain the Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on ACX500 Series, ACX4000 Series: 17.4 versions prior to 17.4R3-S2.

Remediation

vendor remediation guidance

The following software releases have been updated to resolve this specific issue: 17.4R3-S2, and all subsequent releases.

workarounds

There are no viable workarounds for this issue.

Product	Vulnerable range	Fixed version	Advisory
Juniper Networks Junos OS	>=17.4<17.4R3-S2	17.4R3-S2	advisory ↗

References

cvedb.io · NVD · CISA KEV · FIRST EPSS · vendor advisories (CVE Program List v5). Informational only, no warranty — verify every remediation against the vendor advisory before acting on it. This product uses data from the NVD API but is not endorsed or certified by the NVD, CISA, FIRST.org or any vendor named. CVE® is a registered trademark of The MITRE Corporation.