CVE-2021-44852Public exploit

Local kernel code execution via exposed IOCTLs

Published Jan 1, 2022 · Updated Aug 4, 2024

Improper access control in Biostar RACING GT Evo 2.1.1905.1700 allows local users to execute kernel-mode code through driver IOCTLs. BS_RCIO64.sys creates its device with an insufficient DACL; two IOCTLs map attacker-chosen physical memory, while another calls a user-supplied pointer. A low-integrity process that opens the device can read or overwrite physical memory, elevate privileges, or crash Windows without user interaction.

CVSS severity7.8
High
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Biostar RACING GT Evo 2.1.1905.1700 allows local users to execute kernel-mode code through driver IOCTLs. BS_RCIO64.sys creates its device with an insufficient DACL; two IOCTLs map attacker-chosen physical memory, while another calls a user-supplied pointer. A low-integrity process that opens the device can read or overwrite physical memory, elevate privileges, or crash Windows without user interaction.

The record

CVE
CVE-2021-44852
Published
Jan 1, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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

7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C
7.8NIST NVDCVSS: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 exploitPublished

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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