{"id":"CVE-2021-38686","aliases":["EUVD-2021-25125","GHSA-8qv9-29c6-9v3g"],"status":"published","title":"Improper Authentication Vulnerability in VioStor","description":"An improper authentication vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00974,"percentile":0.62295,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2021-11-26T14:00:14Z","modified":"2026-06-17T04:02:35Z","products":[{"vendor":"qnap","product":"qvr"},{"vendor":"qnap systems inc.","product":"qvr"}],"references":[{"url":"https://www.qnap.com/en/security-advisory/qsa-21-52","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38686"},{"url":"https://github.com/advisories/GHSA-8qv9-29c6-9v3g"}],"sources":{"cve":[{"id":"CVE-2021-38686","title":"Improper Authentication Vulnerability in VioStor","description":"An improper authentication vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later","status":"published","published":"2021-11-26T14:00:14.527Z","modified":"2024-09-16T20:16:15.429Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:33:07.349244Z"}],"euvd":[{"id":"EUVD-2021-25125","description":"An improper authentication vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later","status":"published","published":"2021-11-26T14:00:14Z","modified":"2024-09-16T20:16:15Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:15.889317Z"}],"ghsa":[{"id":"GHSA-8qv9-29c6-9v3g","title":"An improper authentication vulnerability has been reported to affect QNAP device, VioStor. If...","description":"An improper authentication vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later","status":"published","published":"2022-05-24T19:21:19Z","modified":"2023-01-30T05:04:12Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:46:59.889535Z"}],"nvd":[{"id":"CVE-2021-38686","description":"An improper authentication vulnerability has been reported to affect QNAP device, VioStor. If exploited, this vulnerability allows attackers to compromise the security of the system. We have already fixed this vulnerability in the following versions of QVR: QVR FW 5.1.6 build 20211109 and later","status":"published","published":"2021-11-26T14:15:07.78Z","modified":"2026-06-17T04:02:35.3Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:07:01.428028Z"}]}}