TeamViewer DEX Client
CVE-2025-44016
HIGH
Severity by source
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Adjacent service access (AV:A) with a simple crafted request and no auth/UI (AC:L/PR:N/UI:N); integrity-bypass RCE as the service yields full C:H/I:H/A:H.
Primary rating from Vendor (teamviewer).
CVSS VectorVendor: teamviewer
Lifecycle Timeline
4DescriptionCVE.org
A vulnerability in TeamViewer DEX Client (former 1E client) - Content Distribution Service (NomadBranch.exe) prior version 25.11 for Windows allows malicious actors to bypass file integrity validation via a crafted request. By providing a valid hash for a malicious file, an attacker can cause the service to incorrectly validate and process the file as trusted, enabling arbitrary code execution under the Nomad Branch service context.
AnalysisAI
Arbitrary code execution in TeamViewer DEX Client (formerly 1E Client) versions prior to 25.11 on Windows allows unauthenticated attackers on an adjacent network to bypass file integrity validation by supplying a valid hash for a malicious file. The Content Distribution Service (NomadBranch.exe) then incorrectly trusts and processes the file, executing code in the service context. No public exploit code has been identified, and the EPSS score is low (0.30%), but the CVSS base score of 8.8 reflects high impact to confidentiality, integrity, and availability. This is a moderately high-priority vulnerability but not an emergency.
Technical ContextAI
The vulnerability resides in the TeamViewer DEX Client's Content Distribution Service (NomadBranch.exe), a component inherited from the 1E Client used for software distribution and content delivery in enterprise environments. The service validates the integrity of files before processing them, but improper input validation (CWE-20) allows an attacker to provide a crafted request that pairs a malicious file with a valid hash, causing the service to accept the file as trusted. This bypasses the intended integrity check and leads to arbitrary code execution under the Nomad Branch service context. The affected product is identified by CPE cpe:2.3:a:teamviewer:digital_employee_experience:*:*:*:*:*:*:*:*, indicating all versions of TeamViewer Digital Employee Experience are potentially affected. Exploitation requires network adjacency (CVSS AV:A) and no authentication (PR:N) or user interaction (UI:N).
RemediationAI
Upgrade to TeamViewer DEX Client version 25.11 or later, which contains the vendor-released patch. Apply the update to all affected Windows systems running the Content Distribution Service (NomadBranch.exe). If immediate upgrade is not possible, restrict network access to the NomadBranch service using firewall rules or network segmentation so that only trusted internal hosts can reach it; this is a compensating control because the vulnerability requires adjacent network access, but it may disrupt legitimate content distribution and software deployment. Monitor for anomalous file processing or unexpected code execution under the Nomad Branch service context. Refer to the vendor advisory at https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2025-1005/ for additional details.
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External POC / Exploit Code
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