CVE-2021-21787 | BDVDB-2026-156421 Detail

Description#

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 0x9c40a0d8, the first dword passed in the input buffer is the device port to write to and the byte at offset 4 is the value to write via the OUT instruction. The OUT instruction can write one byte to the given I/O device port, potentially leading to escalated privileges of unprivileged users.

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History#

1. Version 12021-07-07Record published in the CVE List.
2. Version 22024-08-03Most recent update recorded in the CVE List.