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PatchSiren cyber security CVE debrief

CVE-2026-4483 Moxa CVE debrief

CVE-2026-4483 is an exposed IOCTL with an insufficient access control vulnerability identified in the MxGeneralIo utility for Moxa’s industrial x86 computers. The affected utility exposes IOCTL methods permitting direct read and write access to MSR and system memory. A local attacker with high privileges could exploit these interfaces for unauthorized operations, potentially leading to privilege escalation on Windows 7 systems or a system crash (BSoD) on Windows 10 and 11 systems, causing a denial-of-service condition. The vulnerability may slightly affect device confidentiality and integrity but heavily impact availability.

Vendor
Moxa
Product
MxGeneralIo
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Organizations using Moxa’s industrial x86 computers should prioritize patching this vulnerability to prevent potential local privilege escalation or denial-of-service attacks. Windows 7, 10, and 11 systems are affected, with varying impacts based on the operating system.

Technical summary

The MxGeneralIo utility, used with Moxa’s industrial x86 computers, exposes IOCTL methods that allow direct access to MSR and system memory without adequate access controls. This vulnerability can be exploited by a local attacker with high privileges to perform unauthorized operations. On Windows 7 systems, this could lead to privilege escalation. On Windows 10 and 11 systems, exploitation may result in a system crash (BSoD), leading to a denial-of-service condition. The vulnerability has a CVSS score of 7 and is classified as HIGH severity.

Defensive priority

High priority should be given to patching this vulnerability due to its potential for local privilege escalation and denial-of-service attacks. The vulnerability’s impact on availability is particularly concerning, as it could lead to system crashes on Windows 10 and 11 systems.

Recommended defensive actions

  • Apply patches or updates provided by Moxa for the MxGeneralIo utility to address the insufficient access control vulnerability.
  • Implement compensating controls such as restricting access to the MxGeneralIo utility for only necessary personnel.
  • Monitor system logs for suspicious activity related to IOCTL operations.
  • Consider disabling or restricting the use of the MxGeneralIo utility if patches cannot be applied immediately.
  • Perform regular inventory checks to ensure all Moxa industrial x86 computers are identified and patched.

Evidence notes

The CVE record was published on 2026-04-08T08:16:24.007Z and was last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Awaiting Analysis. Moxa has provided a security advisory (MPSA-254811) detailing the vulnerability and recommended actions.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-04-08T08:16:24.007Z and has not been modified since then. The NVD entry is currently Awaiting Analysis.