CVE-2020-28940
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.94% probability · 90th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- westerndigital/my cloud os 5
- Source
- cve@mitre.org
EPSS 3.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://support.wdc.com/downloads.aspx?g=907&lang=en#downloadsPatch, Vendor Advisory
- https://www.westerndigital.com/support/productsecurity/wdc-20009-os5-firmware-5-06-115Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-1445/Third Party Advisory, VDB Entry
- https://support.wdc.com/downloads.aspx?g=907&lang=en#downloadsPatch, Vendor Advisory
- https://www.westerndigital.com/support/productsecurity/wdc-20009-os5-firmware-5-06-115Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-1445/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.