CVE-2023-1643Public exploit

System crash via unvalidated IOCTL SystemBuffer

Published Mar 26, 2023 · Updated Aug 2, 2024

Denial of service in IObit Malware Fighter 9.4.0.776 allows local users to crash Windows through a crafted driver IOCTL request. The ImfHpRegFilter.sys IOCTL handler accepts six control codes without validating the caller-supplied SystemBuffer before the kernel driver uses it. A normal local user can invoke the exposed handler and trigger a blue-screen system crash, interrupting the endpoint until it reboots.

CVSS severity5.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in IObit Malware Fighter 9.4.0.776 allows local users to crash Windows through a crafted driver IOCTL request. The ImfHpRegFilter.sys IOCTL handler accepts six control codes without validating the caller-supplied SystemBuffer before the kernel driver uses it. A normal local user can invoke the exposed handler and trigger a blue-screen system crash, interrupting the endpoint until it reboots.

The record

CVE
CVE-2023-1643
Published
Mar 26, 2023
Updated
Aug 2, 2024
Vendor
IObit
Product
IObit Malware Fighter
Classifications
CWE-404, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.4.0.776

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

IObit · IObit Malware Fighterversion=9.4.0.776

Published CVSS scores

5.5VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.6VulDBAV:L/AC:L/Au:S/C:N/I:N/A:C

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-404Improper Resource Shutdown or Release
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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