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CVE-2026-23567— Integer underflow in Content Distribution Service UDP handler

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的UDP命令处理器存在整数下溢，可能导致堆缓冲区溢出和服务崩溃。

CVSS 6.5 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-23567

Vulnerability Information
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Vulnerability Title
Integer underflow in Content Distribution Service UDP handler
Source: CVE Program / CVE List V5
Vulnerability Description
An integer underflow in the UDP command handler of the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to trigger a heap-based buffer overflow and cause a denial-of-service (service crash) via specially crafted UDP packets.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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的UDP命令处理器存在整数下溢，可能导致堆缓冲区溢出和服务崩溃。
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-2026-23567

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III. Intelligence Information for CVE-2026-23567

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Vendor Advisories for CVE-2026-23567 (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-2026-23564 6.5 MEDIUM Transmission of Unencrypted Data in Content Distribution Service
CVE-2026-23565 6.5 MEDIUM Denial-of-Service in Content Distribution Service
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-122

V. Comments for CVE-2026-23567

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