High severity8.8NVD Advisory· Published Jul 7, 2021· Updated Jun 17, 2026
CVE-2021-21789
CVE-2021-21789
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 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.
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Affected products
3- cpe:2.3:a:iobit:advanced_systemcare_ultimate:14.2.0.220:*:*:*:*:*:*:*
- IOBit/Advanced SystemCare Ultimatedescription
- Range: =14.2.0.220
Patches
Vulnerability mechanics
References
1- talosintelligence.com/vulnerability_reports/TALOS-2021-1254nvdExploitThird Party Advisory
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