Insecure Storage of Sensitive Information in myQNAPcloud Link

published 2021-06-16 5y ago modified 2026-06-17 4mo ago also EUVD-2021-15471

cvss: 6.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.7%; EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

QNAP Systems Inc. myQNAPcloud Link 2.2.21

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Exploit prediction

1.73% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.0	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
NVD	3.1	4.9	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:P/I:N/A:N

Affected products

QNAP Systems Inc. myQNAPcloud Link

Classification

Weakness

CWE-922 Insecure Storage of Sensitive Information

References

qnap.com /zh-tw/security-advisory/qsa-21-26
vendor-advisory

Sources

CVE List CVE-2021-28815
NVD CVE-2021-28815

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