CVE-2021-21956: Cloudlinux IMUNIFY360

High severity, CVSS 7.8. EPSS: 1.4% chance of exploitation in the next 30 days.

A php unserialize vulnerability exists in the Ai-Bolit functionality of CloudLinux Inc Imunify360 5.10.2. A specially-crafted malformed file can lead to potential arbitrary command execution. An attacker can provide a malicious file to trigger this vulnerability.

Affected products

• Cloudlinux IMUNIFY360: version 5.8 only; version 5.9 only; version 5.10.2 only

Published 2022-04-14. Last modified 2026-06-17.