CVE-2026-18767

Insufficient IOCTL access control allows local access to I/O ports

Published Nov 11, 2026 CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
Description
A local low privileged attacker or process can access I/O ports via TcRouter.sys because of exposed IOCTL function calls resulting in a full compromise of the affected devices.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Description A local low privileged attacker or process can access I/O ports via TcRouter.sys because of exposed IOCTL function calls resulting in a full compromise of the affected devices.
Title Insufficient IOCTL access control allows local access to I/O ports
First Time appeared Beckhoff
Beckhoff tcrouter.sys
Beckhoff twincat.xar.base.km
Weaknesses CWE-782
CPEs cpe:2.3:a:beckhoff:tcrouter.sys:*:*:*:*:*:Windows:x64:*
cpe:2.3:a:beckhoff:tcrouter.sys:*:*:*:*:*:Windows:x86:*
cpe:2.3:a:beckhoff:tcrouter.sys:3.1.0.2364:*:*:*:*:Windows:x64:*
cpe:2.3:a:beckhoff:tcrouter.sys:3.1.0.2364:*:*:*:*:Windows:x86:*
cpe:2.3:a:beckhoff:twincat.xar.base.km:3.16.29:tcpkg:*:*:*:Windows:*:*
cpe:2.3:a:beckhoff:twincat.xar.base.km:tcpkg:*:*:*:*:Windows:*:*
Vendors & Products Beckhoff
Beckhoff tcrouter.sys
Beckhoff twincat.xar.base.km
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.5, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERTVDE
Published
Updated
Nov 12, 2026, 3:00 PM
Reserved
Aug 4, 2026, 7:16 AM
Status
Deferred
Published
Nov 11, 2026, 9:17 AM
Modified
Nov 12, 2026, 8:07 PM