How severe is CVE-2021-36225?

CVE-2021-36225 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-36225 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-36225?

CVE-2021-36225 affects Westerndigital My Cloud Os. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-36225?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-36225 published?

CVE-2021-36225 was published on 2023-02-06 and last updated on 2026-06-17.

CVE-2021-36225

CVE-2021-36225 is a high-severity vulnerability in Westerndigital My Cloud Os with a CVSS 3.x base score of 8.8. 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-862.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Westerndigital My Cloud Os
Published: 2023-02-06
Last modified: 2026-06-17

Description

Western Digital My Cloud devices before OS5 allow REST API access by low-privileged accounts, as demonstrated by API commands for firmware uploads and installation.

Frequently asked questions

What is CVE-2021-36225?: Western Digital My Cloud devices before OS5 allow REST API access by low-privileged accounts, as demonstrated by API commands for firmware uploads and installation.
How severe is CVE-2021-36225?: CVE-2021-36225 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-36225 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36225?: CVE-2021-36225 affects Westerndigital My Cloud Os. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36225?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-36225 published?: CVE-2021-36225 was published on 2023-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:westerndigital:my_cloud_os:*:*:*:*:*:*:*:*

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