Overview
CVE-2025-3711 is a severe cybersecurity vulnerability that affects the LCD KVM over IP Switch CL5708IM. This vulnerability, a stack-based buffer overflow, exposes the system to unauthenticated remote attackers, allowing them to execute arbitrary code on the device. Given the ubiquity of KVM switches in data centers and IT environments, this vulnerability has far-reaching implications for data integrity and system stability.
The critical nature of this vulnerability, reflected in its CVSS severity score of 9.8, indicates a significant risk of system compromise or data leakage. It’s crucial for organizations using the affected device to understand and address this vulnerability promptly to protect their systems and data.
Vulnerability Summary
CVE ID: CVE-2025-3711
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, potential data leakage
Affected Products
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Product | Affected Versions
LCD KVM over IP Switch CL5708IM | All versions prior to the latest patch
How the Exploit Works
A stack-based buffer overflow, like the one present in CVE-2025-3711, occurs when more data is written into a buffer than it can handle. This overflow can overwrite adjacent memory locations, often leading to erratic program behavior, crashes, or, in more severe cases, the execution of malicious code.
In the case of CVE-2025-3711, an unauthenticated remote attacker can send specially crafted network packets to the vulnerable device, causing the buffer overflow. This allows the attacker to manipulate the stack and inject their own malicious code, thereby gaining control over the device.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" }In this example, the ‘A’s represent an overflow of data that the buffer cannot handle, causing it to overflow and potentially enabling the attacker to execute arbitrary code.
Mitigation Guidance
The most effective way to mitigate this vulnerability is to apply the vendor patch as soon as it becomes available. This will fix the buffer overflow vulnerability and prevent potential exploits.
In the meantime, or if patching is not immediately possible, it is recommended to use Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) to monitor network traffic for signs of exploitation of this vulnerability. These tools can provide temporary protection by blocking malicious traffic or alerting system administrators of potential attacks.