CVE-2021-47786Public exploit

Windows crash via malformed driver IOCTL

Published Jan 15, 2026 · Updated Jan 15, 2026

Out-of-bounds write in Redragon Gaming Mouse Driver allows local users to crash Windows through a crafted IOCTL request. REDRAGON_MOUSE.sys accepts IOCTL 0x222414 for the REDRAGON_MOUSE device and mishandles a 2,000-byte input containing 1,000 0x44 bytes followed by 1,000 null bytes. Opening the device and issuing DeviceIoControl requires local access; successful exploitation bugchecks the host without reported data disclosure or modification.

CVSS severity6.8
Medium
EPSS probability0.49%
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 write in Redragon Gaming Mouse Driver allows local users to crash Windows through a crafted IOCTL request. REDRAGON_MOUSE.sys accepts IOCTL 0x222414 for the REDRAGON_MOUSE device and mishandles a 2,000-byte input containing 1,000 0x44 bytes followed by 1,000 null bytes. Opening the device and issuing DeviceIoControl requires local access; successful exploitation bugchecks the host without reported data disclosure or modification.

The record

CVE
CVE-2021-47786
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Redragon
Product
Gaming Mouse Driver
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record 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=all version

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Redragon · Gaming Mouse Driverversion=all version

Published CVSS scores

6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/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.

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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-787Out-of-bounds Write
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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