CVE-2020-28971

Name: CVE-2020-28971
Creator: NVD / NIST
Published: 2020-12-01T16:15:11.003+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.79%

Last modified Jun 17, 2026

CVE-2020-28971 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.79% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.79%

88.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Westerndigital	My Cloud Os 5	< 5.06.115

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-20-1447/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-20-1447/Third Party Advisory, VDB Entry

Timeline

Published: Dec 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28971?

How severe is CVE-2020-28971?

CVE-2020-28971 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.79% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28971?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-28971?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST