What’s Vulnerable › Vulnerabilities

CVE-2021-3310

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-10 · updated 2026-06-17
• Weakness: CWE-59

Description

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).

Affected products

• Western Digital My Cloud: before 5.10.122 — fixed in 5.10.122

How to fix

Upgrade to a fixed version: Western Digital My Cloud 5.10.122. Check the vendor advisory for mitigations.

References

• https://www.westerndigital.com/support/productsecurity/wdc-21002-my-cloud-firmware-version-5-10-122
• https://www.zerodayinitiative.com/advisories/ZDI-21-277/
• https://www.westerndigital.com/support/productsecurity/wdc-21002-my-cloud-firmware-version-5-10-122
• https://www.zerodayinitiative.com/advisories/ZDI-21-277/

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