Integer Underflow Vulnerability in TeamViewer DEX Client
CVE-2026-23567

6.5MEDIUM

Key Information:

Vendor

Teamviewer

Status
Dex
Vendor
CVE Published:
29 January 2026

What is CVE-2026-23567?

The TeamViewer DEX Client (formerly known as 1E Client) contains a vulnerability in its UDP command handler, which, when exploited, allows an attacker on an adjacent network to manipulate specially crafted UDP packets. This manipulation can result in a heap-based buffer overflow, leading to a denial-of-service condition that can crash the service. Users are encouraged to update to version 26.1 or later to mitigate this risk.

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Deploy the Patch

Affected Version(s)

DEX Windows 0 < 26.1

References

https://www.teamviewer.com/en/resources/trust-center/secu...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Threat Hunt Team of Bank of America
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