CVE-2021-21786

Name: CVE-2021-21786
Creator: NVD / NIST
Published: 2021-07-07T17:15:07.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2021-21786 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A privilege escalation vulnerability exists in the IOCTL 0x9c406144 handling of IOBit Advanced SystemCare Ultimate 14.2.0.220. A specially crafted I/O request packet (IRP) can lead to increased privileges. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

A privilege escalation vulnerability exists in the IOCTL 0x9c406144 handling of IOBit Advanced SystemCare Ultimate 14.2.0.220. A specially crafted I/O request packet (IRP) can lead to increased privileges. An attacker can send a malicious IRP to trigger this vulnerability.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.29%

21.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Iobit	Advanced Systemcare Ultimate	14.2.0.220

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1253Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1253Exploit, Third Party Advisory

Timeline

Published: Jul 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21786?

How severe is CVE-2021-21786?

CVE-2021-21786 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21786?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21786?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST