8.1

CVE-2021-44052: qnap systems inc. qts Link Following

CVSS: 8.1v3.1HighModified
Published 05-05-2022Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-44052 is a high (CVSS 8.1) Link Following vulnerability in qnap systems inc. qts. EPSS estimates a 1.59% chance of exploitation in the next 30 days, higher than 75.3% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
1.59%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 05-05-2022
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

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

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.59%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

+0.03 pp

From 1.57% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.59%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Qnap3 products
  • qts≥ 5.0.0.1716, < 5.0.0.1986 | ≥ 4.3.3.0174, < 4.3.3.1945 | ≥ 4.3.4.0899, < 4.3.4.1976 | ≥ 4.3.6.0895, < 4.3.6.1965 | ≥ 4.4.0.0883, < 4.5.4.1991 | 4.2.6:build_20170517 | 4.2.6:build_20190322 | 4.2.6:build_20190730 | 4.2.6:build_20190921 | 4.2.6:build_20191107 | 4.2.6:build_20200109 | 4.2.6:build_20200421 | 4.2.6:build_20200611 | 4.2.6:build_20200821 | 4.2.6:build_20210327 | 4.2.6:build_20211215
  • quts_hero< h4.5.4.1771 | ≥ h5.0.0.1772, < h5.0.0.1986
  • qutscloud< c5.0.1.1998
Qnap systems inc.3 products
  • qts≥ unspecified, < 4.3.4.1976 build 20220303 | ≥ unspecified, < 4.3.3.1945 build 20220303 | ≥ unspecified, < 4.2.6 build 20220304 | ≥ unspecified, < 4.3.6.1965 build 20220302 | ≥ unspecified, < 5.0.0.1986 build 20220324 | ≥ unspecified, < 4.5.4.1991 build 20220329
  • quts hero≥ unspecified, < h4.5.4.1971 build 20220310 | ≥ unspecified, < h5.0.0.1986 build 20220324
  • qutscloud≥ unspecified, < c5.0.1.1998

2 vendors · 6 products

References

1 links