CVE-2025-64987 Overview
CVE-2025-64987 is a command injection vulnerability in TeamViewer Digital Employee Experience (DEX), formerly known as 1E DEX. The flaw resides in the 1E-Explorer-TachyonCore-CheckSimpleIoC instruction, which fails to properly validate user-supplied input [CWE-20, CWE-77]. Authenticated attackers holding Actioner privileges can inject arbitrary operating system commands. Successful exploitation results in remote execution of elevated commands on endpoints connected to the DEX platform. TeamViewer published security bulletin TV-2025-1006 addressing this issue.
Critical Impact
Attackers with Actioner privileges can execute arbitrary elevated commands across all managed endpoints, enabling fleet-wide compromise from a single authenticated session.
Affected Products
- TeamViewer Digital Employee Experience (DEX)
- 1E DEX (legacy product name)
- 1E Tachyon Platform deployments using the 1E-Explorer-TachyonCore-CheckSimpleIoC instruction
Discovery Timeline
- 2025-12-11 - CVE-2025-64987 published to NVD
- 2026-01-14 - Last updated in NVD database
Technical Details for CVE-2025-64987
Vulnerability Analysis
The vulnerability is a command injection flaw in the 1E-Explorer-TachyonCore-CheckSimpleIoC instruction, an Indicator of Compromise (IoC) check distributed through the DEX platform. The instruction accepts parameters that are passed into a command interpreter without sufficient sanitization. An authenticated user with Actioner role privileges can craft input containing shell metacharacters or command separators. The injected payload executes in the security context of the instruction runtime, which typically operates with elevated privileges on managed devices. Because DEX instructions are designed to fan out across thousands of endpoints, a single malicious invocation can reach the entire managed estate.
Root Cause
The root cause is improper input validation [CWE-20] combined with improper neutralization of special elements used in a command [CWE-77]. The CheckSimpleIoC instruction concatenates Actioner-supplied parameters into a command string without escaping, quoting, or argument-array separation. The runtime then forwards the constructed string to a shell or interpreter for execution.
Attack Vector
Exploitation requires network access to the TeamViewer DEX management console and authentication as an Actioner. The attacker submits a CheckSimpleIoC instruction containing a crafted IoC parameter with embedded command syntax. The platform dispatches the instruction to targeted endpoints, where the injected payload runs with the elevated privileges of the instruction agent. No user interaction is required on the receiving endpoints.
No public proof-of-concept code is available for CVE-2025-64987. For technical specifics, refer to the TeamViewer Security Bulletin TV-2025-1006.
Detection Methods for CVE-2025-64987
Indicators of Compromise
- Execution of CheckSimpleIoC instructions containing shell metacharacters such as ;, &&, |, backticks, or $() in parameters
- Unexpected child processes spawned by the 1E Tachyon or TeamViewer DEX agent process on managed endpoints
- Audit log entries showing Actioner-role accounts submitting unusually long or syntactically irregular IoC arguments
- Outbound network connections initiated by the DEX agent process to unfamiliar destinations
Detection Strategies
- Review DEX instruction history for invocations of 1E-Explorer-TachyonCore-CheckSimpleIoC with non-standard or encoded parameters
- Correlate Actioner authentication events with subsequent process-creation telemetry on endpoints receiving instructions
- Hunt for command-line patterns where the DEX agent is the parent process and launches interpreters such as cmd.exe, powershell.exe, or /bin/sh
Monitoring Recommendations
- Forward DEX audit logs and endpoint process telemetry to a centralized analytics platform for correlation
- Alert on any privilege change or Actioner role assignment within the DEX console
- Baseline normal CheckSimpleIoC parameter structures and flag deviations
How to Mitigate CVE-2025-64987
Immediate Actions Required
- Apply the fixed version of TeamViewer DEX as documented in TeamViewer Security Bulletin TV-2025-1006
- Audit the list of accounts assigned the Actioner role and remove unnecessary privileges
- Rotate credentials for any Actioner accounts suspected of compromise
- Review historical executions of 1E-Explorer-TachyonCore-CheckSimpleIoC for signs of abuse
Patch Information
TeamViewer has released a patched version of DEX addressing CVE-2025-64987. Administrators should consult TeamViewer Security Bulletin TV-2025-1006 for the specific fixed build numbers and upgrade instructions. The patch corrects input handling in the CheckSimpleIoC instruction to prevent command injection.
Workarounds
- Restrict the Actioner role to a minimum set of trusted administrators until patching is complete
- Disable or remove the 1E-Explorer-TachyonCore-CheckSimpleIoC instruction from the DEX instruction set if it is not operationally required
- Enforce multi-factor authentication on all DEX console accounts to reduce the risk of credential-based abuse
- Network-segment the DEX management console so that access requires connection through a trusted administrative network
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
