CVE-2021-33462 Use after free in n/a

Medium 5.5 Published 26 Jul 2022 Updated 3 Aug 2024

A use-after-free vulnerability in the Yasm assembler library allows attackers to potentially execute arbitrary code or cause a denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-33462?

CVE-2021-33462 is a medium-severity use after free vulnerability in n/a, published on 26 Jul 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

An issue was discovered in yasm version 1.3.0. There is a use-after-free in expr_traverse_nodes_post() in libyasm/expr.c.

Weakness: CWE-416

Which versions are affected by CVE-2021-33462?

It affects 1 product.

Products include Tortall Yasm.

How do I fix CVE-2021-33462?

No fix has been published for CVE-2021-33462 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-2021-33462 being exploited?

There is no known exploitation of CVE-2021-33462 in the wild and no public exploit code.

Sources

Also known as AZL-10332, AZL-35372, DEBIAN-CVE-2021-33462, GHSA-g6j5-fhvr-ffx9, JLSEC-2026-592, UBUNTU-CVE-2021-33462.