# CVE-2024-39529

## Summary

- **CVE ID:** CVE-2024-39529
- **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-134
- **Published:** Jul 11, 2024
- **Last Modified:** Mar 13, 2026

## Description

A Use of Externally-Controlled Format String vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).



If DNS Domain Generation Algorithm (DGA) detection or tunnel detection, and DNS-filtering traceoptions are configured, and specific valid transit DNS traffic is received this causes a PFE crash and restart, leading to a Denial of Service.

This issue affects Junos OS: 
  *  All versions before 21.4R3-S6,
  *  22.2 versions before 22.2R3-S3,
  *  22.3 versions before 22.3R3-S3,
  *  22.4 versions before 22.4R3,
  *  23.2 versions before 23.2R2.

## Affected Products

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

## References

- [CNA](https://supportportal.juniper.net/JSA82988)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.48%
- **EPSS Percentile:** 39.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._