CVE-2025-46266

Sensitive-data disclosure via coerced internal transmission

Published Dec 11, 2025 · Updated Dec 11, 2025

Improper input validation in TeamViewer DEX Client before 25.11.0.29 allows remote attackers to disclose data through NomadBranch.exe. NomadBranch.exe accepts a crafted network request that coerces the service to transmit data to an attacker-chosen internal IP address; TeamViewer has not identified the mishandled field or validation failure. Exploitation requires local-network access and an enabled Content Distribution Service, which is disabled by default, and affects confidentiality only.

CVSS severity6.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in TeamViewer DEX Client before 25.11.0.29 allows remote attackers to disclose data through NomadBranch.exe. NomadBranch.exe accepts a crafted network request that coerces the service to transmit data to an attacker-chosen internal IP address; TeamViewer has not identified the mishandled field or validation failure. Exploitation requires local-network access and an enabled Content Distribution Service, which is disabled by default, and affects confidentiality only.

The record

CVE
CVE-2025-46266
Published
Dec 11, 2025
Updated
Dec 11, 2025
Vendor
TeamViewer
Product
TeamViewer DEX
Classifications
CWE-20, T1048
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <25.11.0.29

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TeamViewer · TeamViewer DEXversion=0 <25.11.0.29

Published CVSS scores

6.5NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.3TeamViewerCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1048Exfiltration Over Alternative Protocol

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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