CVE-2025-6514 is a critical security vulnerability identified in the mcp-remote tool, a proxy used by Model Context Protocol (MCP) clients, that allows attackers to execute arbitrary OS commands on a machine when it connects to an untrusted MCP server. This flaw poses a high risk of system compromise, particularly affecting mcp-remote versions 0.0.5 to 0.1.15, with the issue resolved in version 0.1.16. The vulnerability is platform-specific, leading to arbitrary command execution on Windows, and potentially on macOS and Linux. Attack scenarios include connecting to compromised or insecure MCP servers, often within local networks. Mitigation involves updating mcp-remote to version 0.1.16 and ensuring connections are made only to trusted servers using HTTPS. The vulnerability highlights the need for caution in the rapidly evolving MCP ecosystem, underscoring the importance of secure connection practices and vigilance against potential vulnerabilities.