CVE-2021-44052
No exploitation reported by the sources we read.
- Published2022-05-05
- Fixed in5.0.0.1986 · 4.5.4.1991 · 4.3.6.1965 · 4.3.4.1976 · 4.3.3.1945
- WeaknessCWE-59
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
An improper link resolution before file access ('Link Following') vulnerability has been reported to affect QNAP device running QuTScloud, QuTS hero, and QTS. If exploited, this vulnerability allows remote attackers to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS: QuTScloud c5.0.1.1998 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTS hero h5.0.0.1986 build 20220324 and later QTS 4.3.4.1976 build 20220303 and later QTS 4.3.3.1945 build 20220303 and later QTS 4.2.6 build 20220304 and later QTS 4.3.6.1965 build 20220302 and later QTS 5.0.0.1986 build 20220324 and later QTS 4.5.4.1991 build 20220329 and later
Timeline
dates in UTC- 2022-05-0517:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-44052?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-44052?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.0 | ≥ 5.0.0.1716, < 5.0.0.1986 | 5.0.0.1986 | NVD |
| 4.x | ≥ 4.4.0.0883, < 4.5.4.1991 | 4.5.4.1991 | NVD |
| 4.3 | ≥ 4.3.6.0895, < 4.3.6.1965 | 4.3.6.1965 | NVD |
| 4.3 | ≥ 4.3.4.0899, < 4.3.4.1976 | 4.3.4.1976 | NVD |
| 4.3 | ≥ 4.3.3.0174, < 4.3.3.1945 | 4.3.3.1945 | NVD |
| 4.2 | = 4.2.6 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | ≥ h5.0.0.1772, < h5.0.0.1986 | h5.0.0.1986 | NVD |
| — | < h4.5.4.1771 | h4.5.4.1771 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| — | < c5.0.1.1998 | c5.0.1.1998 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Qnap qts to 5.0.0.1986 · 4.5.4.1991 · 4.3.6.1965 · 4.3.4.1976 · 4.3.3.1945
Advisories and patches
- www.qnap.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Published
- 2022-05-05
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-44052?
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Same product first, then the same vendor advisory and the same publication week.