How severe is CVE-2021-28815?

CVE-2021-28815 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-28815 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28815?

CVE-2021-28815 affects Qnap Myqnapcloud Link. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28815?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-28815 published?

CVE-2021-28815 was published on 2021-06-16 and last updated on 2026-06-17.

CVE-2021-28815

CVE-2021-28815 is a medium-severity vulnerability in Qnap Myqnapcloud Link with a CVSS 3.x base score of 6.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-922.

Key facts

Severity: Medium (CVSS 3.x base score 6.0)
CVSS v2: 4.0
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-922
Affected product: Qnap Myqnapcloud Link
Published: 2021-06-16
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-28815?: 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.
How severe is CVE-2021-28815?: CVE-2021-28815 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-28815 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28815?: CVE-2021-28815 affects Qnap Myqnapcloud Link. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28815?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28815 published?: CVE-2021-28815 was published on 2021-06-16 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:qnap:myqnapcloud_link:*:*:*:*:*:*:*:*

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