CVE-2025-12687

Service crash via malformed NomadBranch command

Published Dec 11, 2025 · Updated Dec 11, 2025

Improper input validation in TeamViewer DEX Client before 25.11 allows remote attackers to crash NomadBranch.exe via a crafted command. NomadBranch.exe accepts the crafted command without sufficient input validation and terminates the Content Distribution Service. Exploitation requires unauthenticated local-network access and an enabled Content Distribution Service, which is disabled by default.

CVSS severity6.5
Medium
EPSS probability0.21%
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 allows remote attackers to crash NomadBranch.exe via a crafted command. NomadBranch.exe accepts the crafted command without sufficient input validation and terminates the Content Distribution Service. Exploitation requires unauthenticated local-network access and an enabled Content Distribution Service, which is disabled by default.

The record

CVE
CVE-2025-12687
Published
Dec 11, 2025
Updated
Dec 11, 2025
Vendor
TeamViewer
Product
TeamViewer DEX
Classifications
CWE-20, T1499.004
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 <=24.5.0.69 changes=[{"at":"HF-PLTPKG-525","status":"unaffected"}]
  2. Affected versionversion=0 <25.11.0.29
  3. Affected versionversion=0 <=25.5.053 changes=[{"at":"HF-PLTPKG-526","status":"unaffected"}]
  4. Affected versionversion=0 <=25.9.0.46 changes=[{"at":"HF-PLTPKG-524","status":"unaffected"}]

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TeamViewer · TeamViewer DEXversion=0 <=24.5.0.69 changes=[{"at":"HF-PLTPKG-525","status":"unaffected"}]; version=0 <25.11.0.29; version=0 <=25.5.053 changes=[{"at":"HF-PLTPKG-526","status":"unaffected"}]; version=0 <=25.9.0.46 changes=[{"at":"HF-PLTPKG-524","status":"unaffected"}]

Published CVSS scores

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

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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
T1499.004Application or System Exploitation

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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