CVE-2021-28904: Cesnet Libyang

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

In function ext_get_plugin() in libyang <= v1.0.225, it doesn't check whether the value of revision is NULL. If revision is NULL, the operation of strcmp(revision, ext_plugins[u].revision) will lead to a crash.

Affected products

• Cesnet Libyang: up to and including 1.0.225

Published 2021-05-20. Last modified 2026-06-17.