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TI-2021-04834 Aliases CVE-2021-21789GHSA-wg24-w7m2-vvwp

A privilege escalation vulnerability exists in the way IOBit Advanced SystemCare Ultimate…

Priority LOW 38CWE-782Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

A privilege escalation vulnerability exists in the way IOBit Advanced SystemCare Ultimate 14.2.0.220 driver handles Privileged I/O write requests. During IOCTL 0x9c40a0e0, the first dword passed in the input buffer is the device port to write to and the dword at offset 4 is the value to write via the OUT instruction. A local attacker can send a malicious IRP to trigger this vulnerability.

Why it matters now

EPSS 0.00321 25th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—IobitIOBit Advanced SystemCare Ultimate 14.2.0.220—No fix listedCNA
  • Iobit Vendor— Affected IOBit Advanced SystemCare Ultimate 14.2.0.220 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:iobit:advanced_systemcare_ultimate:14.2.0.220:*:*:*:*:*:*:*14.2.0.220VulnerableIObit
  • cpe:2.3:a:iobit:advanced_systemcare_ultimate:14.2.0.220:*:*:*:*:*:*:* Versions 14.2.0.220 Vulnerable ·IObit

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21789
  2. 2026-10-03 Alias added: GHSA-wg24-w7m2-vvwp

References

Exploit 1

  • TI-2024-11747 IObit Advanced SystemCare Utimate IOCTL AscRegistryFilter.sys 0x8001E040 null pointer dereference CVSS 4.0MEDIUM 6.8
  • TI-2024-11746 IObit Advanced SystemCare Utimate IOCTL AscRegistryFilter.sys 0x8001E024 null pointer dereference CVSS 4.0MEDIUM 6.8
  • TI-2024-11745 IObit Advanced SystemCare Utimate IOCTL AscRegistryFilter.sys 0x8001E018 null pointer dereference CVSS 4.0MEDIUM 6.8
  • TI-2024-11744 IObit Advanced SystemCare Utimate IOCTL AscRegistryFilter.sys 0x8001E004 null pointer dereference CVSS 4.0MEDIUM 6.8
  • TI-2024-11743 IObit Advanced SystemCare Utimate IOCTL AscRegistryFilter.sys 0x8001E01C null pointer dereference CVSS 4.0MEDIUM 6.8
  • TI-2024-11742 IObit Advanced SystemCare Utimate IOCTL AscRegistryFilter.sys 0x8001E000 null pointer dereference CVSS 4.0MEDIUM 6.8
See all 28 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences