What is CVE-2026-23567?

CVE-2026-23567 is a medium-severity vulnerability in Microsoft Windows, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-01-29.

How severe is CVE-2026-23567?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Microsoft Windows

CVE-2026-23567

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 buf…

Vulnerability class: Buffer Overflow

EPSS: 0.003 (23.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Microsoft Windows
Teamviewer Dex — versions 0
Teamviewer Digital_employee_experience

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

psirt@teamviewer.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-23567?: CVE-2026-23567 is a medium-severity vulnerability in Microsoft Windows, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-01-29.
How severe is CVE-2026-23567?: Medium severity. CVSS v3 base score is 6.5 out of 10.