CVE-2025-53783 is a heap-based buffer overflow vulnerability identified in Microsoft Teams for Dynamics 365 Remote Assist on HoloLens devices, specifically version 316.0000. The flaw arises from improper handling of memory buffers during network communications, allowing an attacker to overwrite heap memory. This can lead to arbitrary code execution remotely without requiring authentication, though user interaction is necessary to trigger the exploit. The vulnerability impacts confidentiality, integrity, and availability by enabling remote code execution, potentially allowing attackers to take full control of the affected device. The CVSS 3.1 score of 7.5 reflects a high severity due to the network attack vector, no privileges required, but high attack complexity and user interaction needed. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and assigned a CWE-122 classification, indicating a classic heap overflow issue. The affected product is a niche integration of Microsoft Teams tailored for mixed reality collaboration in industrial and enterprise environments, particularly on HoloLens hardware. This vulnerability could be exploited to disrupt critical remote assistance workflows or to pivot into enterprise networks.

For European organizations, this vulnerability poses a significant risk especially to sectors leveraging mixed reality for remote assistance, such as manufacturing, healthcare, and engineering. Successful exploitation could lead to unauthorized access to sensitive operational data, disruption of remote collaboration, and potential lateral movement within corporate networks. Given the integration with HoloLens devices, which are increasingly adopted in advanced industrial environments across Europe, the impact extends to operational technology and critical infrastructure sectors. Confidentiality breaches could expose proprietary designs or patient data, integrity violations could corrupt remote assistance sessions, and availability impacts could halt critical workflows. The requirement for user interaction somewhat limits mass exploitation but targeted attacks against high-value organizations remain a concern. The absence of known exploits currently provides a window for proactive mitigation.

Organizations should immediately inventory and identify any HoloLens devices running Microsoft Teams for D365 Remote Assist version 316.0000. Until patches are released, restrict network access to these devices using segmentation and firewall rules to limit exposure. Implement strict user awareness training to reduce the risk of social engineering that could trigger the exploit. Monitor network traffic and device logs for anomalous activity indicative of exploitation attempts. Employ endpoint detection and response (EDR) solutions capable of detecting heap overflow behaviors. Coordinate with Microsoft for timely patch deployment once available and validate updates in controlled environments before widespread rollout. Consider disabling or limiting the use of the affected Teams integration on HoloLens devices in high-risk environments until mitigations are in place. Maintain up-to-date backups and incident response plans tailored to mixed reality device compromise scenarios.