CVE-2021-21785Public exploit

Local information disclosure via unconstrained PCI reads

Published Aug 5, 2021 · Updated Aug 3, 2024

Information disclosure in IObit Advanced SystemCare Ultimate 14.2.0.220 allows local users to read sensitive device data via a crafted IRP. The Monitor_win10_x64.sys handler for IOCTL 0x9c40a148 passes unconstrained user-controlled offsets and lengths to HalSetBusDataByOffset. Any unprivileged local user who can open the world-readable and world-writable driver device can read PCI configuration and device-specific registers.

CVSS severity6.5
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in IObit Advanced SystemCare Ultimate 14.2.0.220 allows local users to read sensitive device data via a crafted IRP. The Monitor_win10_x64.sys handler for IOCTL 0x9c40a148 passes unconstrained user-controlled offsets and lengths to HalSetBusDataByOffset. Any unprivileged local user who can open the world-readable and world-writable driver device can read PCI configuration and device-specific registers.

The record

CVE
CVE-2021-21785
Published
Aug 5, 2021
Updated
Aug 3, 2024
Vendor
IObit
Product
Advanced SystemCare Ultimate
Classifications
CWE-782, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=IOBit Advanced SystemCare Ultimate 14.2.0.220

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

IObit · Advanced SystemCare Ultimateversion=IOBit Advanced SystemCare Ultimate 14.2.0.220

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.5TalosCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

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

CWE-782Exposed IOCTL with Insufficient Access Control
T1005Data from Local System

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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