CVE-2025-64986 is a command injection vulnerability identified in TeamViewer DEX, formerly known as 1E DEX, specifically affecting the 1E-Explorer-TachyonCore-DevicesListeningOnAPort instruction in versions prior to 21. The root cause is improper input validation (CWE-20), which allows authenticated users with Actioner privileges to inject arbitrary commands. This vulnerability enables remote attackers to execute commands with elevated privileges on devices connected to the platform, potentially compromising the confidentiality, integrity, and availability of those systems. The vulnerability has a CVSS 3.1 base score of 7.2, indicating high severity, with attack vector network (AV:N), low attack complexity (AC:L), requiring high privileges (PR:H), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits are currently reported, the nature of the vulnerability suggests that exploitation could lead to full system compromise of connected devices. The vulnerability affects organizations using TeamViewer DEX for remote device management, especially where Actioner privileges are assigned to users who may be targeted or compromised. The lack of available patches at the time of disclosure necessitates immediate mitigation steps to reduce risk.

For European organizations, this vulnerability poses a significant risk, particularly for those relying on TeamViewer DEX for managing distributed devices remotely. Successful exploitation could lead to unauthorized command execution with elevated privileges, resulting in data breaches, disruption of critical services, or lateral movement within networks. Sectors such as manufacturing, healthcare, energy, and government agencies that use TeamViewer DEX for operational technology or IT device management are especially vulnerable. The high impact on confidentiality, integrity, and availability means sensitive data could be exfiltrated or systems rendered inoperable. Additionally, the requirement for authenticated access with Actioner privileges limits the attack surface but also highlights the importance of strict privilege management. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits following public disclosure.

1. Immediately review and restrict Actioner privileges within TeamViewer DEX to only trusted and necessary users, minimizing the number of accounts that can exploit this vulnerability. 2. Implement strict input validation and command execution monitoring on devices managed via TeamViewer DEX to detect anomalous or unauthorized commands. 3. Employ network segmentation to isolate critical devices managed by TeamViewer DEX, limiting potential lateral movement if exploitation occurs. 4. Monitor logs and alerts for unusual activity related to the 1E-Explorer-TachyonCore-DevicesListeningOnAPort instruction or command injection attempts. 5. Apply principle of least privilege across all remote management tools and enforce multi-factor authentication for accounts with elevated privileges. 6. Stay informed about TeamViewer’s security advisories and apply patches or updates as soon as they become available. 7. Consider temporary suspension or alternative solutions for remote device management if immediate patching is not feasible. 8. Conduct regular security audits and penetration tests focusing on remote management platforms to identify and remediate similar vulnerabilities proactively.