CVE-2024-39529 Denial of service in Junos OS

High 8.7 Published 11 Jul 2024 Updated 2 Aug 2024

An unauthenticated attacker can crash the Packet Forwarding Engine on Juniper SRX devices by sending specific DNS traffic when traceoptions are enabled.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-39529?

CVE-2024-39529 is a high-severity denial of service vulnerability in Juniper Junos, published on 11 Jul 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-134

Which versions are affected by CVE-2024-39529?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2024-39529?

No fix has been published for CVE-2024-39529 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-39529 being exploited?

There is no known exploitation of CVE-2024-39529 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-h69r-jw3j-854f.