CVE-2026-18767
A NVD · · CVE-2026-18767
Admiralty grading (A–F · 1–6)
Source reliability
- A Completely reliable
- B Usually reliable
- C Fairly reliable
- D Not usually reliable
- E Unreliable
- F Cannot be judged
Information credibility
- 1 Confirmed
- 2 Probably true
- 3 Possibly true
- 4 Doubtful
- 5 Improbable
- 6 Cannot be judged
NATO Admiralty (AJP-2.1) grades confidence, independent of the risk score. Cross-source corroboration isn't tracked for non-CVE news, so single-source items are capped at a lower credibility number; a low number does not imply low quality.
Key metrics
- CVSS
- 7.8
- EPSS
- 0%
Key insight
The report shows a local privilege escalation in the Beckhoff TwinCAT driver TcRouter.sys that can enable full compromise of engineering and control systems if they are insufficiently hardened.
Description
CVE-2026-18767 affects the Windows driver TcRouter.sys, which is part of Beckhoff TwinCAT. A locally logged-on attacker with low privileges or a local process can access I/O ports through exposed IOCTL calls. This enables full compromise of the affected system. The report does not contain information about active exploitation or a public PoC.
Risk score
- cvss base
- 78.00
- kev bonus
- 0.00
- epss bonus
- 0.00
- poc bonus
- 0.00
- raw before weight
- 78.00
- industry weight
- 1.21
- freshness factor
- 1.00
- exploitability factor
- 0.75
- days old
- 0.00
- vendor mismatch penalty
- 0.00
Path: operational
MITRE ATT&CK mapping
1 TTPProcedure details
| Technique | Tactic | Procedure | Conf. | Source |
|---|---|---|---|---|
| T1068 Exploitation for Privilege Escalation | Privilege Escalation | A local low privileged attacker or process exploits exposed IOCTL function calls in TcRouter.sys to access I/O ports, which can be leveraged to escalate privileges and achieve full compromise of the affected devices. | high | llm |