# CVE-2024-39531

## Summary

- **CVE ID:** CVE-2024-39531
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L)
- **CWE:** CWE-229
- **Published:** Jul 11, 2024
- **Last Modified:** Mar 13, 2026

## Description

An Improper Handling of Values vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on ACX 7000 Series allows a network-based, unauthenticated attacker to cause a Denial-of-Service (DoS).

If a value is configured for DDoS bandwidth or burst parameters for any protocol in
a queue, all protocols which share the same queue will have
their bandwidth or burst value changed to the new value. If, for example, OSPF was configured with a certain bandwidth value, ISIS would also be limited to this value. So inadvertently either the control plane is open for a high level of specific traffic which was supposed to be limited to a lower value, or the limit for a certain protocol is so low that chances to succeed with a volumetric DoS attack are significantly increased. 




This issue affects Junos OS Evolved on ACX 7000 Series:



  *  All versions before 21.4R3-S7-EVO,
  *  22.1 versions before 22.1R3-S6-EVO, 
  *  22.2 versions before 22.2R3-S3-EVO,
  *  22.3 versions before 22.3R3-S3-EVO, 
  *  22.4 versions before 22.4R3-S2-EVO,
  *  23.2 versions before 23.2R2-EVO,
  *  23.4 

versions 

before 23.4R1-S1-EVO, 23.4R2-EVO.

## Affected Products

- Juniper Networks — Junos OS Evolved (0)
- Juniper Networks — Junos OS Evolved (22.1)
- Juniper Networks — Junos OS Evolved (22.2)
- Juniper Networks — Junos OS Evolved (22.3)
- Juniper Networks — Junos OS Evolved (22.4)
- Juniper Networks — Junos OS Evolved (23.2)
- Juniper Networks — Junos OS Evolved (23.4)

## References

- [CNA](https://supportportal.juniper.net/JSA82991)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.44%
- **EPSS Percentile:** 36.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._