CVE-2021-42779 Use after free in opensc

What is CVE-2021-42779?

CVE-2021-42779 is a medium-severity use after free vulnerability in Fedoraproject Fedora, published on 18 Apr 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A heap use after free issue was found in Opensc before version 0.22.0 in sc_file_valid.

Weakness: CWE-416

Which versions are affected by CVE-2021-42779?

It affects 3 products.

Products include Fedoraproject Fedora, Opensc Project Opensc, Redhat Enterprise Linux.

How do I fix CVE-2021-42779?

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-2021-42779 being exploited?

There is no known exploitation of CVE-2021-42779 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 AZL-9482, DEBIAN-CVE-2021-42779, GHSA-rcjw-9639-853h, UBUNTU-CVE-2021-42779.