PT-2026-5257 · Teamviewer · Teamviewer Dex Client+1

Published 2026-01-29 · Updated 2026-02-11 · CVE-2026-23570

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions TeamViewer DEX Client (former 1E Client) versions prior to 26.1

Description A flaw exists due to insufficient validation of user-supplied data within the Content Distribution Service (NomadBranch.exe) of the TeamViewer DEX Client. This allows a nearby attacker to manipulate log timestamps by sending specially crafted UDP Sync commands. Successful exploitation can lead to the creation of false or illogical datetime prefixes, which compromises the reliability of logs and hinders forensic analysis.

Recommendations Update TeamViewer DEX Client (former 1E Client) to version 26.1 or later.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2026-01130

CVE-2026-23570

Affected Products

1E Client

Teamviewer Dex Client

References · 7

• https://osv.dev/vulnerability/CVE-2026-23570 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-01130 · Security Note
• https://teamviewer.com/en/resources/trust-center/security-bulletins/tv-2026-1001 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23570 · Security Note
• https://twitter.com/CVEnew/status/2016805038669312256 · Twitter Post
• https://t.me/cveNotify/151759 · Telegram Post
• https://t.me/CVEtracker/43226 · Telegram Post