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CVE-2026-18767EUVD-2026-123318

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

TcRouter.sys for Windows (x64 and x86) before 3.1.0.2365 and TwinCAT.XAR.Base.KM before 3.18.1 are affected. Fixed in TcRouter.sys 3.1.0.2365 and TwinCAT.XAR.Base.KM 3.18.1.

Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.

8.5HighCNA
Exploited
No known exploitation
Fix
Fixed in TcRouter.sys for Windows on x64 <3.1.0.2365 3.1.0.2365 · TcRouter.sys for Windows on x86 <3.1.0.2365 3.1.0.2365 · TwinCAT.XAR.Base.KM <3.18.1 3.18.1
Who is exposed
Specific setups only

Do first: Check whether your setup matches what the bug needs. TcRouter.sys for Windows x64 or x86 before 3.1.0.2365 (3.1.0.2364 listed as affected) TwinCAT.XAR.Base.KM 3.16.29 or versions before 3.18.1

Published
Last modified
Reference
Last checked
14/100 · provisional
Specific setups only
None on Exploit-DB, Metasploit or GitHub

Summary

A local attacker with low privileges, or a local process, can reach I/O ports through TcRouter.sys because it exposes IOCTL function calls without proper access control. Successful exploitation can lead to full compromise of the affected Beckhoff Automation software, including TcRouter.sys for Windows and TwinCAT.XAR.Base.KM.

Read the original 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.

Who should check

Teams running Beckhoff TcRouter.sys or TwinCAT.XAR.Base.KM on Windows x64 or x86 systems

Read the source excerpt

“TcRouter.sys for Windows on x64 3.1.0.2364”

certvde.com

cve.now Index

14Pcve.now Index 14 of 100 · methodology v3 · provisional
  • Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
  • Exposure5/25Specific setups only
  • Reach?/20Unknown. No tracked technology or package matched
  • Severity8.5/10CVSS 8.5
  • No patch0/5No signal

What would change the score

  • Would score about 64 if added to CISA KEV
  • Would score about 59 if CISA's SSVC rates exploitation active
  • Would score about 24 if CISA's SSVC rates it automatable

How the score works · Rankings

What to do

  • Check whether your setup matches what the bug needs.

    TcRouter.sys for Windows x64 or x86 before 3.1.0.2365 (3.1.0.2364 listed as affected) TwinCAT.XAR.Base.KM 3.16.29 or versions before 3.18.1

  • Upgrade to a fixed version: TcRouter.sys for Windows on x64 <3.1.0.2365 3.1.0.2365 · TcRouter.sys for Windows on x86 <3.1.0.2365 3.1.0.2365 · TwinCAT.XAR.Base.KM <3.18.1 3.18.1.

Check your systems with an agent

Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.

Check whether my systems are affected by CVE-2026-18767 (Insufficient IOCTL access control allows local access to I/O ports), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-18767 (entry last updated 2026-11-11):
Affected:
- Beckhoff Automation TcRouter.sys for Windows on x64 3.1.0.2364: versions 3.1.0.2364
- Beckhoff Automation TcRouter.sys for Windows on x64 <3.1.0.2365: from 1.0.0, fixed in 3.1.0.2365
- Beckhoff Automation TcRouter.sys for Windows on x86 3.1.0.2364: versions 3.1.0.2364
- Beckhoff Automation TcRouter.sys for Windows on x86 <3.1.0.2365: from 1.0.0, fixed in 3.1.0.2365
- Beckhoff Automation TwinCAT.XAR.Base.KM 3.16.29: versions 3.16.29
- Beckhoff Automation TwinCAT.XAR.Base.KM <3.18.1: from 1.0.0, fixed in 3.18.1
Fixed versions: 3.1.0.2365, 3.18.1.
Conditions (all must be true for the bug to be hit):
- TcRouter.sys for Windows x64 or x86 before 3.1.0.2365 (3.1.0.2364 listed as affected) (source: https://certvde.com/en/advisories/VDE-2026-087/)
- TwinCAT.XAR.Base.KM 3.16.29 or versions before 3.18.1 (source: https://certvde.com/en/advisories/VDE-2026-087/)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: local access, low-privilege login, no user action.
CISA KEV: CVE-2026-18767 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-18767 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://www.certvde.com/en/advisories/VDE-2026-087/
- https://certvde.com/en/advisories/VDE-2026-087/
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-18767
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-18767.

Timeline

  1. CVE published
  2. First seen by cve.now

Affected versions

  • Beckhoff Automation TcRouter.sys for Windows on x64 3.1.0.2364

    3.1.0.2364

  • Beckhoff Automation TcRouter.sys for Windows on x64 <3.1.0.2365

    From 1.0.0 · fixed in 3.1.0.2365

  • Beckhoff Automation TcRouter.sys for Windows on x86 3.1.0.2364

    3.1.0.2364

  • Beckhoff Automation TcRouter.sys for Windows on x86 <3.1.0.2365

    From 1.0.0 · fixed in 3.1.0.2365

  • Beckhoff Automation TwinCAT.XAR.Base.KM 3.16.29

    3.16.29

  • Beckhoff Automation TwinCAT.XAR.Base.KM <3.18.1

    From 1.0.0 · fixed in 3.18.1

Evidence 3

CVE record · 2

Establishes: The identifier and description.

  1. Record
  2. Record

Other links · 1

  1. Link

Corrections

None so far.

Something wrong on this page? Report an error. Every fix is listed here.

Questions about CVE-2026-18767

Is CVE-2026-18767 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data

What does this mean?

Insufficient access control on IOCTL requests lets a local, low-privileged attacker or process reach I/O ports. The advisory says this can lead to full compromise of the affected devices.Source: certvde.com

Which versions are affected by CVE-2026-18767?

TcRouter.sys for Windows on x64 3.1.0.2364: version 3.1.0.2364. TcRouter.sys for Windows on x64 <3.1.0.2365: from 1.0.0 before 3.1.0.2365. TcRouter.sys for Windows on x86 3.1.0.2364: version 3.1.0.2364. TcRouter.sys for Windows on x86 <3.1.0.2365: from 1.0.0 before 3.1.0.2365. TwinCAT.XAR.Base.KM 3.16.29: version 3.16.29. 1 more package is listed on the page.Source: cve.now feed data

Am I affected, and how do I check?

TcRouter.sys for Windows on x64 or x86 before 3.1.0.2365 is affected, and 3.1.0.2364 is listed as affected. TwinCAT.XAR.Base.KM 3.16.29 and versions before 3.18.1 are affected. Compare the installed version of each component against these ranges.Source: certvde.com

How do I fix CVE-2026-18767?

Upgrade TcRouter.sys for Windows to 3.1.0.2365 or later. Upgrade TwinCAT.XAR.Base.KM to 3.18.1 or later.Source: certvde.com

Sources

CVSS details

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

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