CVE-2020-24349 Use after free in n/a

Medium 5.5 Published 13 Aug 2020 Updated 4 Aug 2024

A use-after-free vulnerability in the njs JavaScript engine allows control-flow hijack, potentially leading to code execution, though the vendor disputes remote exploitability.

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

What is CVE-2020-24349?

CVE-2020-24349 is a medium-severity use after free vulnerability in n/a, published on 13 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

njs through 0.4.3, used in NGINX, allows control-flow hijack in njs_value_property in njs_value.c. NOTE: the vendor considers the issue to be "fluff" in the NGINX use case because there is no remote attack surface.

Weakness: CWE-416

Which versions are affected by CVE-2020-24349?

It affects 1 product.

Products include F5 Njs.

How do I fix CVE-2020-24349?

No fix has been published for CVE-2020-24349 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2020-24349 being exploited?

There is no known exploitation of CVE-2020-24349 in the wild and no public exploit code.

Sources

Also known as GHSA-gv5c-89fp-pfpj.