Vulnerability in QNAP Qts
CVE-2021-44052
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
EPSS: 0.015 (72.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Qnap Qts — versions 4.2.6
- Qnap Qutscloud
- Qnap Quts_hero
- Qnap Systems Inc. Qts — versions unspecified
- Qnap Systems Inc. Qutscloud — versions unspecified
- Qnap Systems Inc. Quts Hero — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@qnapsecurity.com.tw (x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-44052?
- CVE-2021-44052 is a medium-severity vulnerability in QNAP Qts, classified under Improper Link Resolution Before File Access. CVSS score: 6.5/10. Published 2022-05-05.
- How severe is CVE-2021-44052?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-44052 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.