CVE-2021-3420 Integer overflow in newlib

What is CVE-2021-3420?

CVE-2021-3420 is a critical vulnerability in Fedoraproject Fedora, published on 5 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A flaw was found in newlib in versions prior to 4.0.0. Improper overflow validation in the memory allocation functions mEMALIGn, pvALLOc, nano_memalign, nano_valloc, nano_pvalloc could case an integer overflow, leading to an allocation of a small buffer and then to a heap-based buffer overflow.

Weakness: CWE-190

Which versions are affected by CVE-2021-3420?

It affects 2 products.

Products include Fedoraproject Fedora, Newlib Project Newlib.

How do I fix CVE-2021-3420?

Upgrade to a fixed version.

Is CVE-2021-3420 being exploited?

There is no known exploitation of CVE-2021-3420 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-3420, GHSA-wp32-4vw5-mw9c, UBUNTU-CVE-2021-3420, openSUSE-SU-2024:11086-1.