CVE-2019-7240Public exploit

Ring-0 code execution via unrestricted MSR writes

Published Mar 25, 2020 · Updated Aug 4, 2024

Privilege escalation in Moo0 System Monitor 1.83 allows local users to execute unsigned code in Ring 0 through the bundled driver. WinRing0x64.sys exposes the wrmsr instruction through IOCTL 0x9C402088 without filtering the target MSR, enabling writes to the system call handler. Exploitation requires the driver to be loaded; otherwise, administrative rights are required to load it, and successful exploitation grants kernel-level execution.

CVSS severity7.2
High
EPSS probability2.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Moo0 System Monitor 1.83 allows local users to execute unsigned code in Ring 0 through the bundled driver. WinRing0x64.sys exposes the wrmsr instruction through IOCTL 0x9C402088 without filtering the target MSR, enabling writes to the system call handler. Exploitation requires the driver to be loaded; otherwise, administrative rights are required to load it, and successful exploitation grants kernel-level execution.

The record

CVE
CVE-2019-7240
Published
Mar 25, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-665, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
7.2NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-665Improper Initialization
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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