What’s Vulnerable › Vulnerabilities

CVE-2019-9950

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-24 · updated 2026-06-17
• Weakness: CWE-521

Description

Western Digital My Cloud, My Cloud Mirror Gen2, My Cloud EX2 Ultra, My Cloud EX2100, My Cloud EX4100, My Cloud DL2100, My Cloud DL4100, My Cloud PR2100 and My Cloud PR4100 firmware before 2.31.174 is affected by an authentication bypass vulnerability. The login_mgr.cgi file checks credentials against /etc/shadow. However, the "nobody" account (which can be used to access the control panel API as a low-privilege logged-in user) has a default empty password, allowing an attacker to modify the My Cloud EX2 Ultra web page source code and obtain access to the My Cloud as a non-Admin My Cloud device user.

Affected products

• Westerndigital My Cloud Dl2100 Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Dl4100 Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Ex2100 Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Ex2 Ultra Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Ex4100 Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Mirror Gen2 Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Pr2100 Firmware: before 2.31.174 — fixed in 2.31.174
• Westerndigital My Cloud Pr4100 Firmware: before 2.31.174 — fixed in 2.31.174

How to fix

Upgrade to a fixed version: Westerndigital My Cloud Dl2100 Firmware 2.31.174; Westerndigital My Cloud Dl4100 Firmware 2.31.174; Westerndigital My Cloud Ex2100 Firmware 2.31.174; Westerndigital My Cloud Ex2 Ultra Firmware 2.31.174; Westerndigital My Cloud Ex4100 Firmware 2.31.174; Westerndigital My Cloud Firmware 2.31.174; Westerndigital My Cloud Mirror Gen2 Firmware 2.31.174; Westerndigital My Cloud Pr2100 Firmware 2.31.174; Westerndigital My Cloud Pr4100 Firmware 2.31.174. Check the vendor advisory for mitigations.

References

• https://bnbdr.github.io/posts/wd/
• https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-174-3-26-19/235932
• https://github.com/bnbdr/wd-rce/
• https://support.wdc.com/downloads.aspx?g=2702&lang=en
• https://bnbdr.github.io/posts/wd/
• https://community.wd.com/t/new-release-my-cloud-firmware-versions-2-31-174-3-26-19/235932
• https://github.com/bnbdr/wd-rce/
• https://support.wdc.com/downloads.aspx?g=2702&lang=en

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