CVE intelligence and bounded remediation

CVE-2019-9950 — Westerndigital My Cloud Firmware security vulnerability

Critical CVSS 9.8

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.

Severity
Critical
CVSS
9.8 (3.0)
Published
2019-04-24
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-521

Affected products

  • westerndigital / my_cloud_firmware
  • westerndigital / my_cloud_mirror_gen2_firmware
  • westerndigital / my_cloud_ex2_ultra_firmware
  • westerndigital / my_cloud_ex2100_firmware
  • westerndigital / my_cloud_ex4100_firmware
  • westerndigital / my_cloud_dl2100_firmware

Showing 6 representative product identities from 9 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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