CVE-2026-18768: Beckhoff TcRouter.sys for Windows on x64

Q: Is CVE-2026-18768 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.

Q: What does this mean?

The driver's IOCTL interface does not properly control access, so a local user can reach arbitrary physical memory. The advisory says this leads to full compromise of the affected devices.

Q: Which versions are affected by CVE-2026-18768?

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.

Q: Am I affected, and how do I check?

TcRouter.sys for Windows on x86 and x64 from 1.0.0 up to but not including 3.1.0.2365, and TwinCAT.XAR.Base.KM before 3.18.1. To check, look up the installed version of the TcRouter.sys driver or the TwinCAT.XAR.Base.KM package in your TwinCAT installation.

Q: How do I fix CVE-2026-18768?

Update TcRouter.sys to 3.1.0.2365 or later, and update TwinCAT.XAR.Base.KM to 3.18.1 or later. The sources list no workaround.

Summary

A local attacker with low privileges can use exposed IOCTL function calls in TcRouter.sys, a driver in Beckhoff Automation's TwinCAT software for Windows, to read arbitrary physical memory or set up its mapping. This requires local access and a login with low privileges, and it can lead to full compromise of the affected devices.

Read the original description

A local low privileged attacker can access arbitrary physical memory or define its mapping 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 on Windows x64 or x86, or TwinCAT.XAR.Base.KM 3.16.29 or earlier 3.18.x builds, before the listed fixed versions.

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

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-2026-18768 (Insufficient IOCTL access control allows local access to arbitrary physical memory), 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-2026-18768 (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.
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-2026-18768 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-18768 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.

Entry: https://cve.now/CVE-2026-18768
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-2026-18768.

Timeline

Nov 11, 2026, 8:19 AM UTCCVE published
Nov 11, 2026, 8:24 AM UTCFirst 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.

Record
CVE List · CVE-2026-18768
Record
NVD · CVE-2026-18768

Corrections

None so far.

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

Questions about CVE-2026-18768

Is CVE-2026-18768 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?

The driver's IOCTL interface does not properly control access, so a local user can reach arbitrary physical memory. The advisory says this leads to full compromise of the affected devices.Source: certvde.com

Which versions are affected by CVE-2026-18768?

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 x86 and x64 from 1.0.0 up to but not including 3.1.0.2365, and TwinCAT.XAR.Base.KM before 3.18.1. To check, look up the installed version of the TcRouter.sys driver or the TwinCAT.XAR.Base.KM package in your TwinCAT installation.Source: certvde.com

How do I fix CVE-2026-18768?

Update TcRouter.sys to 3.1.0.2365 or later, and update TwinCAT.XAR.Base.KM to 3.18.1 or later. The sources list no workaround.Source: certvde.com

Insufficient IOCTL access control allows local access to arbitrary physical memory