CVE-2021-20231 Use after free in gnutls

What is CVE-2021-20231?

CVE-2021-20231 is a critical use after free vulnerability in Fedoraproject Fedora, published on 12 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 gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.

Weakness: CWE-416

Which versions are affected by CVE-2021-20231?

It affects 5 products.

Products include Fedoraproject Fedora, Gnu Gnutls, Netapp Active Iq Unified Manager, Netapp E-Series Performance Analyzer, Redhat Enterprise Linux.

How do I fix CVE-2021-20231?

Upgrade to a fixed version.

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-2021-20231 being exploited?

There is no known exploitation of CVE-2021-20231 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 ALPINE-CVE-2021-20231, AZL-6446, DEBIAN-CVE-2021-20231, GHSA-mqq9-xchh-h97q, JLSEC-2026-520, UBUNTU-CVE-2021-20231.