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CVE-2026-23564— Transmission of Unencrypted Data in Content Distribution Service

Quick assessment

Affected
TeamViewer DEX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TeamViewer DEX Client是德国TeamViewer公司的一个数字化员工体验和终端管理软件。 TeamViewer DEX Client 26.1之前版本存在安全漏洞，该漏洞源于Content Distribution Service处理不当，可能导致加密UDP流量以明文发送，造成信息泄露。

CVSS 6.5 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories
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I. Basic Information for CVE-2026-23564

Vulnerability Information
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Vulnerability Title
Transmission of Unencrypted Data in Content Distribution Service
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an attacker on the adjacent network to cause normally encrypted UDP traffic to be sent in cleartext. This can result in disclosure of sensitive information.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5
Vulnerability Title
TeamViewer DEX Client 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TeamViewer DEX Client是德国TeamViewer公司的一个数字化员工体验和终端管理软件。 TeamViewer DEX Client 26.1之前版本存在安全漏洞，该漏洞源于Content Distribution Service处理不当，可能导致加密UDP流量以明文发送，造成信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TeamViewer DEX 0 ~ 26.1 -

II. Public POCs for CVE-2026-23564

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III. Intelligence Information for CVE-2026-23564

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Vendor Advisories for CVE-2026-23564 (1)

Same Patch Batch · TeamViewer · 2026-01-29 · 9 CVEs total

CVE-2026-23571 6.8 MEDIUM Command Injection in 1E-Nomad-RunPkgStatusRequest Instruction in TeamViewer DEX
CVE-2026-23570 6.5 MEDIUM Log timestamp tampering vulnerability in Content Distribution Service
CVE-2026-23569 6.5 MEDIUM Out-of-bounds read vulnerability in Content Distribution Service
CVE-2026-23565 6.5 MEDIUM Denial-of-Service in Content Distribution Service
CVE-2026-23567 6.5 MEDIUM Integer underflow in Content Distribution Service UDP handler
CVE-2026-23566 6.5 MEDIUM Log Injection in Content Distribution Service UDP Handler
CVE-2026-23563 5.7 MEDIUM Privilege escalation in TeamViewer DEX via DeleteFileByPath instruction
CVE-2026-23568 5.4 MEDIUM Out-of-bounds read vulnerability in Content Distribution Service

IV. Related Vulnerabilities

Same product: DEX
Same vendor: TeamViewer
Same weakness: CWE-319

V. Comments for CVE-2026-23564

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