CVE-2020-28940

CRITICALNVD 9.89.8—

9.8

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 v3: 9.8
EG Score: 9.8(medium)
EPSS: 88.0%
KEV: Not listed

Published

December 1, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated May 26, 2026

No patch confirmed yet.

generic

ZDI-20-1445 | Zero Day Initiative

https://www.zerodayinitiative.com/advisories/ZDI-20-1445/

generic

WDC-20009 OS 5 Firmware 5.06.115 | WD

https://www.westerndigital.com/support/productsecurity/wdc-20009-os5-firmware-5-06-115

generic

Software and Firmware Downloads | WD Support

https://support.wdc.com/downloads.aspx?g=907&lang=en#downloads

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-287Improper Authentication

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:45 UTCepss_batch
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2026-06-05 06:08 UTCepss_batch
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2026-06-04 13:10 UTCepss_batch
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2026-05-31 22:29 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2020-28940?

CVE-2020-28940 is a critical vulnerability published on December 1, 2020. 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.

When was CVE-2020-28940 disclosed?

CVE-2020-28940 was first published in the National Vulnerability Database on December 1, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-28940 actively exploited?

CVE-2020-28940 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-28940?

CVE-2020-28940 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2020-28940?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-28940, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2020-28940

📅 Published

🔄 Last Modified

📋 Advisory Details (3)

ZDI-20-1445 | Zero Day Initiative

WDC-20009 OS 5 Firmware 5.06.115 | WD

Software and Firmware Downloads | WD Support

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-28940?

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Advisory Details (3)

Frequently asked(5)

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