Vulnerability Details CVE-2021-21788
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 0x9c40a0dc, the first dword passed in the input buffer is the device port to write to and the word 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. A local attacker can send a malicious IRP to trigger this vulnerability.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 34.3%
CVSS Severity
CVSS v3 Score 8.8
CVSS v2 Score 4.6
References
Products affected by CVE-2021-21788
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cpe:2.3:a:iobit:advanced_systemcare_ultimate:14.2.0.220