Log timestamp tampering vulnerability in Content Distribution Service

published 2026-01-29 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-4994

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

A missing validation of a user-controlled value in the TeamViewer DEX Client (former 1E Client) - Content Distribution Service (NomadBranch.exe) prior version 26.1 for Windows allows an adjacent network attacker to tamper with log timestamps via crafted UDP Sync command. This could result in forged or nonsensical datetime prefixes and compromising log integrity and forensic correlation.

Patch / fix

fixed in 1

TeamViewer DEX 26.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 9 mo ago (2026-01-29)

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

TeamViewer DEX

Classification

Weakness

CWE-20 Improper Input Validation

References

teamviewer.com /en/resources/trust-center/security-bulletins/tv-2026-1001/
vendor-advisory

Sources

CVE List CVE-2026-23570
NVD CVE-2026-23570

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Summary