Overview
CVE-2025-11243 identifies a vulnerability affecting Shelly Pro 4PM devices prior to version 1.6. This vulnerability stems from a lack of proper limits or throttling mechanisms when allocating resources, allowing an attacker to potentially exhaust device resources via network requests. This can lead to denial-of-service (DoS) conditions, impacting the device’s functionality and availability.
Technical Details
The vulnerability resides in how the Shelly Pro 4PM handles network requests. Without proper resource management (limits and throttling), a malicious actor can flood the device with requests that consume excessive resources, such as memory or CPU. The specifics of the affected network protocols or API endpoints exploited are detailed in the referenced vulnerability advisories.
Specifically, an attacker could craft and send a large number of requests designed to:
- Trigger memory allocation without proper bounds checking.
- Initiate resource-intensive computations repeatedly.
- Overload network connections leading to instability.
CVSS Analysis
Currently, the CVE details indicate that the Severity and CVSS Score are N/A. This might be because the analysis is still ongoing, or the severity is context-dependent. Further investigation and official scoring are needed to accurately assess the risk associated with this vulnerability. Once available, the CVSS score will provide a standardized metric for evaluating the exploitability and impact of this issue.
Possible Impact
The exploitation of CVE-2025-11243 can have several significant impacts:
- Denial of Service (DoS): The most likely outcome is a DoS attack, rendering the Shelly Pro 4PM unresponsive and unable to perform its intended function.
- Device Instability: Resource exhaustion can lead to system crashes or unpredictable behavior.
- Potential for Further Exploitation: While not immediately apparent, resource exhaustion vulnerabilities can sometimes be chained with other vulnerabilities to gain further control over the device.
Mitigation and Patch Steps
The primary mitigation step is to update your Shelly Pro 4PM devices to version 1.6 or later. This version includes fixes that address the resource allocation issue. Here’s how to update:
- Access the Shelly Pro 4PM’s web interface.
- Navigate to the “Firmware Update” section.
- Check for available updates and follow the on-screen instructions to install the latest version (v1.6 or later).
In addition to patching, consider implementing network-level security measures, such as rate limiting or intrusion detection systems, to detect and mitigate suspicious network traffic targeting your Shelly Pro 4PM devices.
