Overview
In the ever-evolving landscape of cybersecurity, a new vulnerability has been discovered that could potentially put systems and data at risk. This vulnerability, designated as CVE-2025-6514, is associated with the mcp-remote software, which is used for connecting to MCP servers. The vulnerability arises due to the exposure of mcp-remote to OS command injection when connecting to untrusted MCP servers, leading to a potential system compromise or data leakage. This issue is especially crucial due to the high severity score of 9.6 assigned to it, indicating its potential for widespread damage if exploited.
Vulnerability Summary
CVE ID: CVE-2025-6514
Severity: Critical (9.6 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise and data leakage
Affected Products
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Product | Affected Versions
mcp-remote | All versions prior to the patched
How the Exploit Works
The vulnerability arises from the crafted input from the authorization_endpoint response URL. If the mcp-remote software is connected to an untrusted MCP server, an attacker can inject commands into the authorization_endpoint response URL. Because the software does not properly sanitize the input from this URL, the injected commands are executed on the operating system running the mcp-remote software. This can lead to unauthorized access, system compromise, and potential data leakage.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited:
POST /authorization_endpoint HTTP/1.1
Host: untrusted.example.com
Content-Type: application/json
{ "malicious_payload": "injectable_os_command" }In the above example, the “injectable_os_command” is a stand-in for any command that can be executed on the operating system running mcp-remote. Once this request is sent to the software, it executes the command, leading to the potential consequences described earlier.
Mitigation and Prevention
To mitigate this vulnerability, users of mcp-remote should immediately apply the vendor patch once available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary protection by identifying and blocking suspicious activities. Regularly updating and patching your software, using trusted servers, and routinely monitoring system activities are also recommended preventative measures to enhance cybersecurity resilience.