CVE-2023-1639Public exploit

Local system crash via malformed driver IOCTL

Published Mar 26, 2023 · Updated Feb 19, 2025

Denial of service in IObit Malware Fighter 9.4.0.776 allows local users to crash Windows through a crafted driver IOCTL request. The ImfRegistryFilter.sys handler for IOCTL 0x8001E04C searches the user-controlled buffer for a carriage-return and line-feed delimiter, then accesses uninitialized memory when that delimiter is absent. An ordinary local user can trigger a blue-screen crash, interrupting the entire system rather than only the security application.

CVSS severity5.5
Medium
EPSS probability0.32%
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 ImfRegistryFilter.sys handler for IOCTL 0x8001E04C searches the user-controlled buffer for a carriage-return and line-feed delimiter, then accesses uninitialized memory when that delimiter is absent. An ordinary local user can trigger a blue-screen crash, interrupting the entire system rather than only the security application.

The record

CVE
CVE-2023-1639
Published
Mar 26, 2023
Updated
Feb 19, 2025
Vendor
IObit
Product
IObit Malware Fighter
Classifications
CWE-404, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2025Record 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

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.6NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499Endpoint Denial of Service

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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