{"id":"CVE-2021-43042","aliases":["EUVD-2021-29996","GHSA-8xcf-7jjj-p7rh"],"status":"published","title":"An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow...","description":"An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow existed in the vaultServer component. This was exploitable by a remote unauthenticated attacker.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.0299,"percentile":0.87515,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2021-12-06T00:00:00Z","modified":"2026-06-17T04:10:25Z","products":[{"vendor":"kaseya","product":"unitrends_backup"}],"references":[{"url":"https://helpdesk.kaseya.com/hc/en-gb/articles/4412762258961","tags":["x_transferred","Vendor Advisory"]},{"url":"https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-1","tags":["x_transferred","Exploit","Third Party Advisory"]},{"url":"https://www.cyberonesecurity.com/blog/exploiting-kaseya-unitrends-backup-appliance-part-2","tags":["x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43042"},{"url":"https://github.com/advisories/GHSA-8xcf-7jjj-p7rh"}],"sources":{"cve":[{"id":"CVE-2021-43042","description":"An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow existed in the vaultServer component. This was exploitable by a remote unauthenticated attacker.","status":"published","published":"2021-12-06T00:00:00Z","modified":"2024-08-04T03:47:13.285Z","updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-29996","description":"An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow existed in the vaultServer component. This was exploitable by a remote unauthenticated attacker.","status":"published","published":"2021-12-06T00:00:00Z","modified":"2024-08-04T03:47:13Z","updated_at":"2026-11-03T03:24:14.796505Z"}],"ghsa":[{"id":"GHSA-8xcf-7jjj-p7rh","title":"An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow...","description":"An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow existed in the vaultServer component. This was exploitable by a remote unauthenticated attacker.","status":"published","published":"2021-12-07T00:00:43Z","modified":"2023-02-03T05:01:57Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:53:04.437142Z"}],"nvd":[{"id":"CVE-2021-43042","description":"An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. A buffer overflow existed in the vaultServer component. This was exploitable by a remote unauthenticated attacker.","status":"published","published":"2021-12-06T04:15:07.557Z","modified":"2026-06-17T04:10:25.36Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:07:01.811115Z"}]}}