Improper Limitation of a Pathname to a Restricted Directory in QTS
Published Dec 31, 2020
9.1
CRITICALCVSS 3.1
EPSS 1.12%
Description
A vulnerability has been reported to affect earlier QNAP devices running QTS 4.3.4 to 4.3.6. Caused by improper limitations of a pathname to a restricted directory, this vulnerability allows for renaming arbitrary files on the target system, if exploited. QNAP have already fixed this vulnerability in the following versions: QTS 4.3.6.0895 build 20190328 (and later) QTS 4.3.4.0899 build 20190322 (and later) This issue does not affect QTS 4.4.x or QTS 4.5.x.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<4.3.4.0899
- Version unspecifiedStatusaffectedConstraints<4.3.6.0895
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| QNAP Systems Inc. | QTS | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
QNAP have already fixed this vulnerability in the following versions:
QTS 4.3.6.0895 build 20190328 (and later) QTS 4.3.4.0899 build 20190322 (and later) This issue does not affect QTS 4.4.x or QTS 4.5.x.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:P/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.12% (0.01124) | 65.05th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.11% (0.01110) | 64.46th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.10% (0.00102) | 42.34th | v3 (v2023.03.01) |
| Sep 16, 2023 | 0.10% (0.00102) | 41.35th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.09% (0.00090) | 36.69th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.42% (0.00416) | 10.04th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.42% (0.00416) | 0.00th | v1 |
References (1)
- https://www.qnap.com/zh-tw/security-advisory/qsa-20-21 x_refsource_MISCVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://www.qnap.com/zh-tw/security-advisory/qsa-20-21 | x_refsource_MISCVendor Advisory |
Change history (0)
No recorded changes yet.