CVE-2021-43037
mediumpriority · track · 31EPSS 0.005 · 44 %ileEUUSEPSS · scored 2026-10-27
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The Unitrends Windows agent was vulnerable to DLL injection and binary planting due to insecure default permissions. This allowed privilege escalation from an unprivileged user to SYSTEM.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (10)
External citations — patches, advisories, analysis.
- https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-43037cnnvd
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1cnnvd
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2cnnvd
- https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961enisa_euvd
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1enisa_euvd
- https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2enisa_euvd
- https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961Vendor Advisorynvd
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