CVE-2025-64990 is a command injection vulnerability identified in TeamViewer DEX (formerly 1E DEX), specifically affecting the 1E-Explorer-TachyonCore-LogoffUser instruction in versions prior to 21.1. The root cause is improper input validation (CWE-20), which allows attackers who have authenticated access with 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 is network-based (AV:N), requires low attack complexity (AC:L), but necessitates high privileges (PR:H) and user interaction (UI:R). The scope is unchanged (S:U), but the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are reported in the wild, the vulnerability poses a significant risk because it could allow attackers to execute arbitrary commands remotely, potentially leading to full system compromise, data exfiltration, or disruption of services. The vulnerability affects all versions prior to 21.1, and no official patches or mitigation links are currently published. Given TeamViewer DEX's role in device management and remote operations, exploitation could severely impact enterprise environments.

For European organizations, especially those relying on TeamViewer DEX for remote device management and operational tasks, this vulnerability presents a substantial risk. Successful exploitation could lead to unauthorized command execution with elevated privileges, compromising the confidentiality of sensitive data, integrity of system configurations, and availability of critical services. This could disrupt business operations, lead to data breaches, or facilitate lateral movement within networks. Sectors such as manufacturing, critical infrastructure, healthcare, and finance that use TeamViewer DEX for managing distributed devices are particularly vulnerable. The requirement for authenticated access with Actioner privileges limits the attack surface but insider threats or compromised credentials could enable exploitation. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate the potential for targeted attacks. European organizations must consider the regulatory implications of breaches resulting from this vulnerability, including GDPR compliance and incident reporting obligations.

1. Upgrade TeamViewer DEX to version 21.1 or later as soon as the patch becomes available to address the vulnerability directly. 2. Until patches are available, restrict Actioner privileges strictly to trusted personnel and minimize the number of users with these rights. 3. Implement robust multi-factor authentication (MFA) to reduce the risk of credential compromise for accounts with elevated privileges. 4. Monitor logs and audit trails for unusual command execution patterns or unauthorized access attempts related to the 1E-Explorer-TachyonCore-LogoffUser instruction. 5. Employ network segmentation to isolate devices managed via TeamViewer DEX from critical infrastructure where feasible. 6. Conduct regular security awareness training emphasizing the risks of credential misuse and the importance of safeguarding privileged accounts. 7. Prepare incident response plans specifically addressing potential exploitation scenarios involving remote command execution. 8. Engage with TeamViewer support or security advisories to receive updates on patches and mitigation guidance.