How severe is CVE-2020-28971?

CVE-2020-28971 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-28971 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28971?

CVE-2020-28971 affects Westerndigital My Cloud Os 5. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-28971?

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

When was CVE-2020-28971 published?

CVE-2020-28971 was published on 2020-12-01 and last updated on 2026-06-17.

CVE-2020-28971

CVE-2020-28971 is a critical-severity vulnerability in Westerndigital My Cloud Os 5 with a CVSS 3.x base score of 9.8. 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Westerndigital My Cloud Os 5
Published: 2020-12-01
Last modified: 2026-06-17

Description

An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin authentication bypass vulnerability could allow an unauthenticated user to execute privileged commands on the device via a cookie, because of insufficient validation of URI paths.

Frequently asked questions

What is CVE-2020-28971?: An issue was discovered on Western Digital My Cloud OS 5 devices before 5.06.115. A NAS Admin authentication bypass vulnerability could allow an unauthenticated user to execute privileged commands on the device via a cookie, because of insufficient validation of URI paths.
How severe is CVE-2020-28971?: CVE-2020-28971 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-28971 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28971?: CVE-2020-28971 affects Westerndigital My Cloud Os 5. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-28971?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-28971 published?: CVE-2020-28971 was published on 2020-12-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:westerndigital:my_cloud_os_5:*:*:*:*:*:*:*:*

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