CVE-2025-64989 identifies a command injection vulnerability in TeamViewer DEX, formerly known as 1E DEX, specifically affecting versions prior to 21.1. The flaw exists in the 1E-Explorer-TachyonCore-FindFileBySizeAndHash instruction, where improper input validation (CWE-20) allows authenticated attackers possessing Actioner privileges to inject arbitrary commands. This vulnerability enables remote execution of commands with elevated privileges on devices connected to the TeamViewer DEX platform, potentially compromising the entire managed environment. The vulnerability has a CVSS 3.1 base score of 7.2, reflecting network attack vector, low attack complexity, required high privileges, no user interaction, and high impact on confidentiality, integrity, and availability. Although no public exploits are currently known, the ability to execute arbitrary commands remotely poses a significant risk, especially in environments where TeamViewer DEX is used for endpoint management and remote control. The lack of available patches at the time of publication necessitates immediate mitigation strategies. The vulnerability's exploitation scope includes any device connected via TeamViewer DEX that relies on the vulnerable instruction, potentially affecting a broad range of enterprise endpoints.

For European organizations, the impact of this vulnerability is substantial. Successful exploitation could lead to unauthorized command execution on critical devices, resulting in data breaches, disruption of services, or lateral movement within networks. Confidentiality is at risk due to potential data exposure, integrity can be compromised by unauthorized changes, and availability may be affected if critical systems are disrupted. Organizations in sectors such as finance, healthcare, manufacturing, and government, which often use remote management tools like TeamViewer DEX, face heightened risks. The requirement for authenticated Actioner privileges limits exposure but does not eliminate risk, especially if credential compromise or insider threats occur. The absence of known exploits provides a window for proactive defense, but the high severity score underscores the urgency for mitigation to prevent potential exploitation.

European organizations should immediately audit and restrict Actioner privileges within TeamViewer DEX to the minimum necessary users. Implement strict access controls and monitor for unusual command execution patterns or privilege escalations. Network segmentation should isolate devices managed via TeamViewer DEX to limit lateral movement in case of compromise. Since no patches are currently available, consider temporarily disabling or limiting the use of the vulnerable instruction (1E-Explorer-TachyonCore-FindFileBySizeAndHash) if feasible. Employ multi-factor authentication and robust credential management to reduce the risk of privilege abuse. Regularly review and update endpoint detection and response (EDR) tools to detect anomalous command injection attempts. Maintain close communication with TeamViewer for timely patch releases and apply updates immediately upon availability. Additionally, conduct user training to raise awareness about the risks associated with elevated privileges and remote management tools.