CVE-2024-23440Public exploit

Local system crash via unchecked IOCTL pointer

Published Feb 13, 2024 · Updated May 19, 2025

Out-of-bounds read in Vba32 Antivirus 3.36.0 allows local users to crash Windows via a crafted Vba32m64.sys IOCTL request. The driver's 0x22200B handler copies up to 0x802 bytes from an address supplied through lpInBuffer into a global driver variable without validating the pointer. Low-privileged local access is required; an invalid address triggers a system crash, while no read result is known to reach user space.

CVSS severity7.1
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Vba32 Antivirus 3.36.0 allows local users to crash Windows via a crafted Vba32m64.sys IOCTL request. The driver's 0x22200B handler copies up to 0x802 bytes from an address supplied through lpInBuffer into a global driver variable without validating the pointer. Low-privileged local access is required; an invalid address triggers a system crash, while no read result is known to reach user space.

The record

CVE
CVE-2024-23440
Published
Feb 13, 2024
Updated
May 19, 2025
Vendor
VirusBlokAda
Product
Vba32 Antivirus
Classifications
CWE-125, CAPEC-540, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 13, 2024CVE publishedPublication date reported by the CVE source.
  2. May 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=3.36.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

VirusBlokAda · Vba32 Antivirusversion=3.36.0

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1Fluid AttacksCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1499.004Application 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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