CVE-2025-29967 is a heap-based buffer overflow vulnerability identified in the Microsoft Remote Desktop client for Windows Desktop, version 1.2.0.0. The vulnerability resides in the Remote Desktop Gateway Service component, which facilitates secure remote connections to internal network resources. A heap-based buffer overflow occurs when the service improperly handles input data, allowing an attacker to overwrite memory on the heap. This memory corruption can be exploited to execute arbitrary code remotely without requiring authentication, although user interaction is necessary. The vulnerability is classified under CWE-122, indicating unsafe memory handling leading to buffer overflow. The CVSS v3.1 score of 8.8 reflects high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. The flaw was reserved in March 2025 and published in May 2025, with no public exploits reported yet. The absence of patches at the time of reporting increases the urgency for defensive measures. The vulnerability's network attack vector and potential for remote code execution make it a critical threat for organizations using Remote Desktop Gateway services, especially those exposing these services to the internet or untrusted networks.

The exploitation of CVE-2025-29967 can lead to complete system compromise, allowing attackers to execute arbitrary code remotely on affected Windows Desktop clients. This can result in unauthorized access to sensitive data, disruption of services, and potential lateral movement within corporate networks. For European organizations, the impact is significant due to widespread use of Microsoft Remote Desktop for remote work and IT management. Confidentiality breaches could expose personal data protected under GDPR, leading to regulatory penalties and reputational damage. Integrity and availability impacts could disrupt critical business operations, especially in sectors like finance, healthcare, and government. The requirement for user interaction slightly reduces the risk but does not eliminate it, as phishing or social engineering could facilitate exploitation. The lack of known exploits in the wild currently provides a window for proactive defense, but the high severity score underscores the need for immediate attention.

1. Monitor Microsoft security advisories closely and apply official patches immediately upon release to remediate the vulnerability. 2. Until patches are available, restrict Remote Desktop Gateway exposure by limiting access to trusted IP addresses via firewall rules and VPNs. 3. Implement network segmentation to isolate Remote Desktop services from critical infrastructure and sensitive data stores. 4. Enforce multi-factor authentication (MFA) for all remote access to reduce the risk of user interaction exploitation. 5. Deploy endpoint detection and response (EDR) solutions to identify anomalous behavior indicative of exploitation attempts. 6. Educate users on phishing and social engineering risks to minimize the chance of triggering the vulnerability. 7. Regularly audit Remote Desktop configurations to ensure minimal attack surface and disable unnecessary features. 8. Utilize intrusion prevention systems (IPS) with signatures or heuristics targeting Remote Desktop Gateway anomalies. 9. Conduct penetration testing and vulnerability assessments focusing on Remote Desktop services to identify and remediate weaknesses proactively.