8.8
CWE
782
Advisory Published
Updated

CVE-2021-21789

First published: Wed Jul 07 2021(Updated: )

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.

Credit: talos-cna@cisco.com

Affected SoftwareAffected VersionHow to fix
IOBit Advanced SystemCare Ultimate=14.2.0.220

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Frequently Asked Questions

  • What is CVE-2021-21789?

    CVE-2021-21789 is a privilege escalation vulnerability in IOBit Advanced SystemCare Ultimate 14.2.0.220.

  • What is the severity of CVE-2021-21789?

    The severity of CVE-2021-21789 is high, with a score of 8.8.

  • How does CVE-2021-21789 work?

    CVE-2021-21789 allows malicious actors to escalate privileges by exploiting the way the IOBit Advanced SystemCare Ultimate 14.2.0.220 driver handles Privileged I/O write requests.

  • How can I fix CVE-2021-21789?

    To fix CVE-2021-21789, update IOBit Advanced SystemCare Ultimate to version 14.2.0.220 or install the latest available patch.

  • Where can I find more information about CVE-2021-21789?

    You can find more information about CVE-2021-21789 at this link: [https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254](https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254)

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