CVE-2021-27419 uClibc-ng Integer Overflow or Wraparound

High 7.3 Published 3 May 2022 Updated 16 Apr 2025

An integer overflow in uClibc-ng's malloc-simple function allows attackers to cause crashes or execute arbitrary code via improper memory allocation.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2021-27419?

CVE-2021-27419 is a high-severity vulnerability in uClibc-ng, published on 3 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

uClibc-ng versions prior to 1.0.37 are vulnerable to integer wrap-around in functions malloc-simple. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Weakness: CWE-190

Which versions are affected by CVE-2021-27419?

It affects 1 product.

Products include Uclibc-Ng Project Uclibc-Ng.

How do I fix CVE-2021-27419?

Upgrade to a fixed version.

Is CVE-2021-27419 being exploited?

There is no known exploitation of CVE-2021-27419 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2021-27419, GHSA-499x-cvfw-94w6.