CVE-2021-38686 json
Improper Authentication Vulnerability in VioStor
published 2021-11-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-25125
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- QNAP Systems Inc. QVR QVR FW 5.1.6 build 20211109
Exploit prediction
0.97% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- QNAP Systems Inc. QVR
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
qnap.com
/en/security-advisory/qsa-21-52
vendor-advisory
Sources
- CVE List CVE-2021-38686
- NVD CVE-2021-38686
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