CVE-2021-28815

Name: CVE-2021-28815
Creator: NVD / NIST
Published: 2021-06-16T04:15:08.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 1.71%

Last modified Jun 17, 2026

CVE-2021-28815 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. Insecure storage of sensitive information has been reported to affect QNAP NAS running myQNAPcloud Link. If exploited, this vulnerability allows remote attackers to read sensitive information by accessing the unrestricted storage mechanism. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

Description

Insecure storage of sensitive information has been reported to affect QNAP NAS running myQNAPcloud Link. If exploited, this vulnerability allows remote attackers to read sensitive information by accessing the unrestricted storage mechanism. This issue affects: QNAP Systems Inc. myQNAPcloud Link versions prior to 2.2.21 on QTS 4.5.3; versions prior to 2.2.21 on QuTS hero h4.5.2; versions prior to 2.2.21 on QuTScloud c4.5.4.

Metrics

CVSS 3.1

4.9/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

1.71%

74.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-922

Affected Software

Vendor	Product	Versions
Qnap	Myqnapcloud Link	< 2.2.21

References

https://www.qnap.com/zh-tw/security-advisory/qsa-21-26Vendor Advisory
https://www.qnap.com/zh-tw/security-advisory/qsa-21-26Vendor Advisory

Timeline

Published: Jun 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28815?

How severe is CVE-2021-28815?

CVE-2021-28815 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28815?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28815?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST