SB2025121124 - Multiple vulnerabilities in TeamViewer DEX Client for Windows

Description

This security bulletin contains information about 3 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2025-44016)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of file hash in the Content Distribution Service (NomadBranch.exe). A remote attacker on the local network can supply a valid hash for a malicious file and force the service to incorrectly validate and process the file as trusted, leading to remote code execution. 

2) Input validation error (CVE-ID: CVE-2025-12687)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the Content Distribution Service (NomadBranch.exe). A remote attacker on the local network can send a specially crafted command to the affected service and perform a denial of service (DoS) attack.

3) Input validation error (CVE-ID: CVE-2025-46266)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of user-supplied input within the Content Distribution Service (NomadBranch.exe). A remote attacker on the local network can force the service into transmitting data to an arbitrary internal IP address, leading to information disclosure. 

Remediation

Install update from vendor's website.

References

• https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2025-1005/