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Tool Directory

CVE-2021-3310

HighPublished

Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and...

Published: Mar 10, 2021
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: Aug 4, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 61.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Western Digital My Cloud OS 5 devices before 5.10.122 mishandle Symbolic Link Following on SMB and AFP shares. This can lead to code execution and information disclosure (by reading local files).

Sources

CVE-2021-3310PoC
Western Digital MyCloud PR4100 Link Resolution Information Disclosure Vulnerability

Responsible use

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