CVE-2024-39539 Junos OS: MX Series: Continuous subscriber logins will lead to a memory leak and eventually an FPC crash

Medium 6.0 Published 11 Jul 2024 Updated 2 Aug 2024

Unauthenticated adjacent attackers can cause a Denial of Service on Juniper MX Series devices by triggering a memory leak through continuous subscriber logins.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-39539?

CVE-2024-39539 is a medium-severity denial of service vulnerability in Juniper Junos, published on 11 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A Missing Release of Memory after Effective Lifetime vulnerability in Juniper Networks Junos OS on MX Series allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).

In a subscriber management scenario continuous subscriber logins will trigger a memory leak and eventually lead to an FPC crash and restart.

This issue affects Junos OS on MX Series:

* All version before 21.2R3-S6, * 21.4 versions before 21.4R3-S6, * 22.1 versions before 22.1R3-S5, * 22.2 versions before 22.2R3-S3, * 22.3 versions before 22.3R3-S2, * 22.4 versions before 22.4R3, * 23.2 versions before 23.2R2.

Weakness: CWE-401

Which versions are affected by CVE-2024-39539?

It affects 1 product.

Products include Juniper Junos.

How do I fix CVE-2024-39539?

No fix has been published for CVE-2024-39539 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-2024-39539 being exploited?

There is no known exploitation of CVE-2024-39539 in the wild and no public exploit code.

All Juniper Junos vulnerabilities

Sources

Also known as GHSA-5gvg-fggq-r6f6.