Vulnerability · Published Jan 29, 2026 · Assigned by TV
CVE-2026-23567Integer underflow in Content Distribution Service UDP handler
Medium 6.5
In plain English
A medium-severity heap buffer overflow in DEX from TeamViewer. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 71.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TeamViewer | DEX | 0 – before 26.1 |
Weakness: CWE-122 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H