{"cve":"CVE-2021-43037","nvd":{"published":"2021-12-06T04:15:07.287","modified":"2026-06-17T04:10:24.773","status":"Modified","description":"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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-427"],"references":["https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961","https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1","https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2","https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961","https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1"],"products":["kaseya:unitrends_backup"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-43037","score":0.00521,"percentile":0.44226,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}