# CVE-2021-0233

## Summary

- **CVE ID:** CVE-2021-0233
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-794, CWE-400
- **Published:** Apr 22, 2021
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- Juniper Networks — Junos OS (17.4)

## References

- [CNA](https://kb.juniper.net/JSA11128)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.54%
- **EPSS Percentile:** 67.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._