Critical severity9.8NVD Advisory· Published Dec 6, 2021· Updated Jun 17, 2026
CVE-2021-43033
CVE-2021-43033
Description
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. Multiple functions in the bpserverd daemon were vulnerable to arbitrary remote code execution as root. The vulnerability was caused by untrusted input (received by the server) being passed to system calls.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3cpe:2.3:a:kaseya:unitrends_backup:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:kaseya:unitrends_backup:*:*:*:*:*:*:*:*range: >=10.0,<10.5.5
- (no CPE)range: <10.5.5
- Kaseya/Unitrends Backup Appliancedescription
Patches
Vulnerability mechanics
References
3- www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1nvdExploitThird Party Advisory
- www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2nvdExploitThird Party Advisory
- helpdesk.kaseya.com/hc/en-gb/articles/4412762258961nvdVendor Advisory
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