CVE-2024-33221

Local privilege escalation via unrestricted driver IOCTLs

Published May 22, 2024 · Updated Feb 13, 2025

Privilege escalation in AsusBSItf.sys in ASUSTeK ASUS BIOS Flash Driver 3.2.12.0 allows local users to execute code via crafted IOCTL requests. The DeviceIoControl handler exposes physical-memory mapping and I/O-port access without restricting caller privileges. A low-privileged Windows account can invoke the driver to execute code with elevated privileges and disclose or modify physical memory.

CVSS severity7.8
High
EPSS probability0.18%
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 AsusBSItf.sys in ASUSTeK ASUS BIOS Flash Driver 3.2.12.0 allows local users to execute code via crafted IOCTL requests. The DeviceIoControl handler exposes physical-memory mapping and I/O-port access without restricting caller privileges. A low-privileged Windows account can invoke the driver to execute code with elevated privileges and disclose or modify physical memory.

The record

CVE
CVE-2024-33221
Published
May 22, 2024
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-782, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

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

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-782Exposed IOCTL with Insufficient Access Control
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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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