CVE-2021-21789

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.

CVSS v3.1

8.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.0

8.8 HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v2.0

4.6 MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS

0.32% chance of exploitation in the next 30 days, 25th percentile

Published

2021-07-07

Updated

2024-08-03

Proof-of-concept exploits (1)

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1254

References

• CVE Record
• NVD entry

Related

• CVE-2021-21788
• CVE-2021-21790
• CVE-2021-21787
• CVE-2021-21791
• CVE-2021-21786
• CVE-2021-21792