CVE-2021-43043: Kaseya Unitrends Backup

Medium severity, CVSS 6.5. EPSS: 1.5% chance of exploitation in the next 30 days.

An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The apache user could read arbitrary files such as /etc/shadow by abusing an insecure Sudo rule.

Affected products

• Kaseya Unitrends Backup: from 10.0, before 10.5.5 (fixed in 10.5.5)

Published 2021-12-06. Last modified 2026-06-17.