CVE-2022-29844: Western Digital My Cloud OS 5 arbitrary file read and write vulnerability via ftp

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 36.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-01-26 · updated 2026-06-17
Weakness: CWE-23

Description

A vulnerability in the FTP service of Western Digital My Cloud OS 5 devices running firmware versions prior to 5.26.119 allows an attacker to read and write arbitrary files. This could lead to a full NAS compromise and would give remote execution capabilities to the attacker.

Affected products

Westerndigital My Cloud Dl2100 Firmware: before 5.26.119 — fixed in 5.26.119
Westerndigital My Cloud Dl4100 Firmware: before 5.26.119 — fixed in 5.26.119
Westerndigital My Cloud Ex2100 Firmware: before 5.26.119 — fixed in 5.26.119
Westerndigital My Cloud Ex2 Ultra Firmware: before 5.26.119 — fixed in 5.26.119
Westerndigital My Cloud Ex4100 Firmware: before 5.26.119 — fixed in 5.26.119
Westerndigital My Cloud Mirror G2 Firmware: before 5.26.119 — fixed in 5.26.119
Westerndigital My Cloud Pr2100 Firmware: before 5.26.119 — fixed in 5.26.119
Westerndigital My Cloud Pr4100 Firmware: before 5.26.119 — fixed in 5.26.119

How to fix

Upgrade to a fixed version: Westerndigital My Cloud Dl2100 Firmware 5.26.119; Westerndigital My Cloud Dl4100 Firmware 5.26.119; Westerndigital My Cloud Ex2100 Firmware 5.26.119; Westerndigital My Cloud Ex2 Ultra Firmware 5.26.119; Westerndigital My Cloud Ex4100 Firmware 5.26.119; Westerndigital My Cloud Mirror G2 Firmware 5.26.119; Westerndigital My Cloud Pr2100 Firmware 5.26.119; Westerndigital My Cloud Pr4100 Firmware 5.26.119. Check the vendor advisory for mitigations.

References

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