{"cve":"CVE-2021-43033","nvd":{"published":"2021-12-06T04:15:07.093","modified":"2026-06-17T04:10:24.307","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-78"],"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-2021-43033","score":0.06188,"percentile":0.93504,"date":"2026-11-01"},"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."]}