CVE-2025-30247 Overview
CVE-2025-30247 is a critical OS command injection vulnerability affecting Western Digital My Cloud NAS devices running firmware versions prior to 5.31.108. This vulnerability exists within the user interface component and allows remote attackers to execute arbitrary system commands on vulnerable devices by sending specially crafted HTTP POST requests. As a network-attached storage platform commonly deployed in both home and small business environments, successful exploitation could result in complete device compromise and unauthorized access to stored data.
Critical Impact
Remote attackers can execute arbitrary system commands without authentication, potentially leading to complete device takeover, data exfiltration, ransomware deployment, or use of the device as a pivot point for further network attacks.
Affected Products
- Western Digital My Cloud NAS devices running firmware versions prior to 5.31.108
- Western Digital My Cloud OS 5 platform
Discovery Timeline
- 2025-09-29 - CVE-2025-30247 published to NVD
- 2025-10-02 - Last updated in NVD database
Technical Details for CVE-2025-30247
Vulnerability Analysis
This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS command injection. The flaw exists in the web-based user interface of the My Cloud firmware, where user-supplied input is improperly sanitized before being passed to system command execution functions. This allows attackers to inject malicious shell commands that are executed with the privileges of the web application process.
The attack is network-accessible and requires no authentication or user interaction, making it particularly dangerous for Internet-exposed devices. The vulnerability affects confidentiality, integrity, and availability of the affected system, enabling attackers to read sensitive files, modify system configurations, or render the device inoperable.
Root Cause
The root cause of CVE-2025-30247 is insufficient input validation and sanitization in the My Cloud web interface. When processing certain HTTP POST parameters, the application fails to properly escape or validate user input before incorporating it into shell commands. This allows attackers to break out of the intended command context and inject additional commands using shell metacharacters such as semicolons (;), pipes (|), command substitution ($()), or other special characters.
Attack Vector
The attack is conducted over the network via HTTP POST requests to the vulnerable My Cloud user interface. An attacker does not need valid credentials or any prior access to the device. The exploitation flow involves:
- An attacker identifies a My Cloud device accessible over the network
- The attacker crafts a malicious HTTP POST request containing shell metacharacters and injected commands
- The vulnerable web application processes the request and passes unsanitized input to a system command
- The injected commands execute with the web application's privileges on the underlying Linux system
Due to the unauthenticated nature of this vulnerability and the common practice of exposing NAS devices to the Internet for remote access, this vulnerability presents a significant risk to affected deployments.
Detection Methods for CVE-2025-30247
Indicators of Compromise
- Unusual outbound network connections from the NAS device to unknown external hosts
- Unexpected processes running on the My Cloud device, particularly shell processes spawned by the web server
- Modified system files or configurations on the NAS device
- Presence of unauthorized user accounts or SSH keys
- Suspicious entries in web server access logs showing unusual POST request parameters
Detection Strategies
- Monitor HTTP traffic to My Cloud devices for POST requests containing shell metacharacters such as ;, |, $(), or backticks
- Implement network-based intrusion detection rules to identify command injection patterns in web traffic
- Review web server logs for anomalous request patterns or error messages indicating command execution failures
- Deploy endpoint detection capabilities to monitor for unexpected process creation on NAS devices
Monitoring Recommendations
- Enable verbose logging on My Cloud devices if supported and forward logs to a centralized SIEM
- Implement network segmentation to isolate NAS devices and monitor inter-segment traffic
- Configure alerts for any outbound connections from NAS devices to non-approved destinations
- Regularly audit user accounts and access permissions on NAS devices
How to Mitigate CVE-2025-30247
Immediate Actions Required
- Update Western Digital My Cloud firmware to version 5.31.108 or later immediately
- Restrict network access to the My Cloud web interface using firewall rules, limiting access to trusted IP addresses only
- Remove any Internet-facing exposure of My Cloud devices until patching is complete
- Review device logs for signs of exploitation or unauthorized access
Patch Information
Western Digital has released firmware version 5.31.108 to address this vulnerability. Administrators should download and apply the update from the official Western Digital support portal. The security advisory is available at the Western Digital Firmware Advisory.
Workarounds
- Disable remote access features and ensure the device is only accessible from trusted local network segments
- Implement network-level access controls using firewalls or VLANs to restrict access to the web interface
- If immediate patching is not possible, consider temporarily disconnecting the device from the network
- Monitor for vendor updates and apply patches as soon as they become available
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
