CVE-2020-28940

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-01 · updated 2026-06-17
Weakness: CWE-287

Description

On Western Digital My Cloud OS 5 devices before 5.06.115, the NAS Admin dashboard has an authentication bypass vulnerability that could allow an unauthenticated user to execute privileged commands on the device.

Affected products

Westerndigital My Cloud Os 5: before 5.06.115 — fixed in 5.06.115

How to fix

Upgrade to a fixed version: Westerndigital My Cloud Os 5 5.06.115. Check the vendor advisory for mitigations.

References

https://support.wdc.com/downloads.aspx?g=907&lang=en#downloads
https://www.westerndigital.com/support/productsecurity/wdc-20009-os5-firmware-5-06-115
https://www.zerodayinitiative.com/advisories/ZDI-20-1445/
https://support.wdc.com/downloads.aspx?g=907&lang=en#downloads
https://www.westerndigital.com/support/productsecurity/wdc-20009-os5-firmware-5-06-115
https://www.zerodayinitiative.com/advisories/ZDI-20-1445/

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