CVE-2025-66576 is an OS command injection vulnerability identified in Remotecontrolio's Remote Keyboard Desktop version 1.0.1. The flaw stems from improper neutralization of special elements used in OS commands (CWE-78), specifically within the rundll32.exe exported function. This vulnerability permits remote attackers to execute arbitrary system commands without requiring authentication or user interaction. The attack vector involves sending crafted input that is passed unsanitized to the rundll32.exe function, enabling execution of malicious commands on the target system. The vulnerability's CVSS 4.0 score is 8.9, reflecting its high impact and ease of exploitation. The vulnerability affects the confidentiality, integrity, and availability of affected systems, potentially allowing attackers to take full control, exfiltrate data, or disrupt operations. No patches or official mitigations have been published yet, and no known exploits are currently observed in the wild. However, the critical nature of the vulnerability and the common use of remote desktop tools in enterprise environments make it a significant risk. The vulnerability is particularly dangerous because it requires no privileges or user interaction, increasing the attack surface. The rundll32.exe utility is a legitimate Windows component often used to execute DLLs, and its misuse here facilitates the injection of malicious commands. Organizations using Remote Keyboard Desktop 1.0.1 should consider immediate risk assessments and implement compensating controls while awaiting vendor patches.

For European organizations, this vulnerability poses a severe risk due to the potential for complete system compromise without authentication or user interaction. Attackers exploiting this flaw can execute arbitrary commands, leading to data breaches, ransomware deployment, espionage, or disruption of critical services. Enterprises relying on Remote Keyboard Desktop for remote access or IT management could see operational outages and loss of sensitive information. The high CVSS score indicates a broad impact on confidentiality, integrity, and availability. Given the increasing reliance on remote work and remote management tools across Europe, this vulnerability could be leveraged to target financial institutions, government agencies, healthcare providers, and critical infrastructure operators. The lack of known exploits currently provides a window for proactive defense, but the ease of exploitation means attackers may develop exploits rapidly. The impact is magnified in sectors with strict regulatory requirements for data protection, such as GDPR compliance, where breaches could result in significant fines and reputational damage.

Since no official patch is currently available, European organizations should implement immediate compensating controls. These include restricting network access to Remote Keyboard Desktop instances via firewalls or VPNs to trusted IPs only, thereby reducing exposure to unauthenticated attackers. Employ application whitelisting to prevent unauthorized execution of rundll32.exe with unexpected parameters. Monitor and analyze logs for unusual rundll32.exe activity or unexpected command executions. Disable or limit the use of Remote Keyboard Desktop where feasible until a patch is released. Employ endpoint detection and response (EDR) solutions to detect and block suspicious command injection attempts. Conduct thorough asset inventories to identify all instances of Remote Keyboard Desktop 1.0.1 and prioritize remediation. Educate IT staff about this vulnerability and ensure incident response plans are updated to address potential exploitation scenarios. Once a patch is released, deploy it promptly and verify successful remediation through vulnerability scanning and penetration testing.