CVE-2021-3310

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).

CVSS v3.1 NVD

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

CVSS v2.0 NVD

4.6 MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS

1.01% chance of exploitation in the next 30 days, 62nd percentile

Published

2021-03-10

Updated

2024-08-03

Proof-of-concept exploits (1)

• piffd0s/CVE-2021-33101★ · 2021-05-24

Security advisories

• https://www.westerndigital.com/support/productsecurity/wdc-21002-my-cloud-firmware-versio…
• https://www.zerodayinitiative.com/advisories/ZDI-21-277

References

• CVE Record
• NVD entry

Related

• CVE-2026-40369