CVE-2021-42205

System crash via double-handled IOCTL request

Published Nov 7, 2022 · Updated May 2, 2025

Denial of service in the ELAN Miniport touchpad Windows driver before 24.21.51.2 allows local users to crash Windows via a crafted IOCTL. The driver processes the special IOCTL request twice, causing a Windows blue-screen crash. Exploitation requires locally running a purpose-built program with knowledge of the specific IOCTL; ELAN reports no private-data exposure.

CVSS severity4.7
Medium
EPSS probability0.26%
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 the ELAN Miniport touchpad Windows driver before 24.21.51.2 allows local users to crash Windows via a crafted IOCTL. The driver processes the special IOCTL request twice, causing a Windows blue-screen crash. Exploitation requires locally running a purpose-built program with knowledge of the specific IOCTL; ELAN reports no private-data exposure.

The record

CVE
CVE-2021-42205
Published
Nov 7, 2022
Updated
May 2, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-703, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 7, 2022CVE publishedPublication date reported by the CVE source.
  2. May 2, 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

4.7CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/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.

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-703Improper Check or Handling of Exceptional Conditions
T1499Endpoint Denial of Service

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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