CVE-2025-64991 is a medium-severity command injection vulnerability identified in TeamViewer DEX (formerly 1E DEX) prior to version 15. The flaw exists in the 1E-PatchInsights-Deploy 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. The attack vector requires network access (AV:N), low attack complexity (AC:L), but high privileges (PR:H) and user interaction (UI:R). The scope is unchanged (S:U), but the impact is high on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits have been reported, the vulnerability poses a significant risk due to the elevated privileges required and the potential for widespread impact on managed devices. TeamViewer DEX is widely used for IT asset management and patch deployment, making this vulnerability particularly critical in environments where automated deployment and remote management are essential. The lack of available patches at the time of disclosure necessitates immediate risk mitigation through access control and monitoring.

For European organizations, this vulnerability could lead to unauthorized command execution on critical IT infrastructure managed via TeamViewer DEX, potentially resulting in data breaches, system compromise, or disruption of services. The ability to execute elevated commands remotely could allow attackers to install malware, exfiltrate sensitive data, or disrupt patch deployment processes, undermining operational security and compliance with regulations such as GDPR. Organizations relying heavily on TeamViewer DEX for remote management and patching are at increased risk, especially those in sectors with stringent security requirements like finance, healthcare, and government. The medium CVSS score reflects the need for caution, as exploitation requires authenticated access with elevated privileges, but the consequences of a successful attack are severe. The absence of known exploits currently provides a window for proactive defense, but the risk of future exploitation remains.

1. Immediately review and restrict Actioner privileges to the minimum necessary users, enforcing the principle of least privilege. 2. Monitor and audit all command execution logs within TeamViewer DEX for unusual or unauthorized activities. 3. Implement network segmentation to limit access to the TeamViewer DEX platform and connected devices. 4. Apply any patches or updates from TeamViewer as soon as they become available to address this vulnerability. 5. Use multi-factor authentication (MFA) for all users with elevated privileges to reduce the risk of credential compromise. 6. Conduct regular security awareness training for administrators to recognize and report suspicious activities. 7. Consider deploying endpoint detection and response (EDR) solutions to detect anomalous command execution on managed devices. 8. Establish incident response plans specifically addressing potential exploitation scenarios involving remote command injection.