If you use WD My Cloud devices to store and access your files, pay attention: a critical vulnerability has been discovered that could allow an attacker to execute remote commands on your system. This flaw, identified as CVE-2025-30247, affects several Western Digital NAS models and poses a serious risk to the confidentiality and integrity of your information.
At TecnetOne, we want to explain what’s happening, which models are affected, and most importantly, how you can protect yourself.
The vulnerability is a classic case of OS Command Injection. In simple terms, it allows an attacker to send crafted requests —specifically, specially designed HTTP POSTs— to the WD My Cloud web interface, tricking the device into executing arbitrary commands.
The result? The attacker can:
Access your files without permission
Modify or delete them
Change system settings
Enumerate users
Run malicious binaries for even greater control
In short: someone could take over your NAS without needing physical access or advanced credentials.
Western Digital has confirmed that the vulnerability impacts several My Cloud devices, widely used in small offices and homes. Affected models include:
My Cloud PR2100
My Cloud PR4100
My Cloud EX4100
My Cloud EX2 Ultra
My Cloud Mirror Gen 2
My Cloud DL2100
My Cloud EX2100
My Cloud DL4100
My Cloud WDBCTLxxxxxx-10
The company has released firmware 5.31.108 as a fix for most of these models. However, there’s a problem: DL4100 and DL2100 models are End of Support (EoS), meaning they won’t receive official updates. For these users, the only real mitigation is to take devices offline or migrate to a more secure solution.
Learn more: Relationship between Vulnerability Management and Patch Management
You might think WD My Cloud isn’t meant for critical enterprise use —and that’s true. Its primary audience is consumers, small offices, and home environments. These devices are used for personal cloud storage, remote access via mobile apps or browsers, automated backups, and content streaming.
But their convenience and remote connectivity make them an attractive target for attackers. In the past, similar NAS vulnerabilities have been exploited to:
Steal sensitive data
Build botnets of thousands of infected devices
Use them as proxies to mask other attacks
Distribute ransomware and extort victims
So even if you “just” use your WD My Cloud for photos or personal files, the risk of your device becoming a weapon in cybercrime is very real.
The best defense is applying patch 5.31.108 as soon as possible. Western Digital released it on September 23, 2025, and if you have automatic updates enabled, it may already be installed. Still, it’s recommended to check:
Log in to your device’s web interface
Go to Settings > Firmware Update
Verify the installed version
If you don’t have the latest version, you can:
Automatic: enable auto-update so the device updates itself
Manual: download the BIN file for your model from Western Digital’s official site, go to Update from File, and select the downloaded file
Important: keep the device powered on and plugged in during the update to avoid data corruption. Afterward, a reboot is required.
If you can’t apply the patch immediately, the safest move is to disconnect the device from the internet and use it only in local (LAN) mode. This way, you’ll still have access to your files within your internal network but won’t be exposed to remote attacks.
The tradeoff is that you’ll lose remote cloud access via Western Digital, but that’s far better than risking a compromise.
The WD My Cloud case highlights several key truths about cybersecurity:
No connected device is risk-free. Even home NAS devices can be targets.
Lifecycle matters. Using End-of-Support (EoS) equipment is risky because it no longer receives patches.
Updating must be routine. Installation isn’t enough; you must periodically verify versions.
The perimeter is gone. Personal devices often connect to work environments, multiplying the attack surface.
At TecnetOne, we always emphasize that security isn’t just about servers and firewalls —it also depends on the “small” devices you connect daily, which can easily become backdoors for attackers.
Similar titles: 8 Steps to Performing a Network Vulnerability Assessment
To stay protected against CVE-2025-30247, take these immediate steps:
Update to 5.31.108 immediately
If your device is EoS, disconnect it from the internet
Monitor logs and system behavior regularly
Migrate to a supported model if using DL2100 or DL4100
At TecnetOne, we know NAS devices like WD My Cloud are a vital part of infrastructure for many businesses, including SMEs. That’s why we offer:
Vulnerability management to detect and prioritize flaws like this one
Proactive monitoring to alert you of suspicious activity on connected devices
Migration planning if you’re using unsupported hardware
Cyber hygiene training to help your team respond effectively to alerts
The CVE-2025-30247 vulnerability shows just how fragile connected storage devices can be. A single flaw can open the door to data theft, ransomware, or your NAS being hijacked for broader attacks.
The good news: a patch is available, and if you act quickly, you can minimize the risk. At TecnetOne, we encourage you to check your device today, update it, and make sure your information stays safe.
In cybersecurity, the line between a crisis and a scare is called prevention.