Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control Vulnerability

Microsoft Windows Kernel contains an exposed IOCTL with insufficient access control vulnerability within the IOCTL (input and output control) dispatcher in appid.sys that allows a local attacker to achieve privilege escalation.

Published 23 Sep 2026Updated 23 Sep 20261277 sources
CVSS 7.8 ✓ VERIFIED REFERENCE△ CISA KEV

What happened

Microsoft Windows Kernel contains an exposed IOCTL with insufficient access control vulnerability within the IOCTL (input and output control) dispatcher in appid.sys that allows a local attacker to achieve privilege escalation.

Affected versions

Windows: See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references

RepositoryAuthorFirst seenReference
Exploit-DB 51946Microsoft Windows 10.0.17763.5458 - Kernel Privilege EscalationE1 Coders2024-04-02VerifiedExploit-DB 52275Microsoft Windows 11 - Kernel Privilege EscalationMilad karimi2025-04-22VerifiedSploituskcfg bypass example demonstrating the configuration bypass for CVE-2024-21338.KitPloit2026-09-23T21:38:00Candidatekitploit.comkcfg bypass example demonstrating the configuration bypass for CVE-2024-21338.zh2026-09-23T21:38:00CandidatePoC-in-GitHub · hakaioffsec/CVE-2024-21338Local Privilege Escalation from Admin to Kernel vulnerability on Windows 10 and Windows 11 operating systems with HVCI enabled.★ 332hakaioffsec2024-04-13CandidatePoC-in-GitHub · UMU618/CVE-2024-21338Fork of https://github.com/hakaioffsec/CVE-2024-21338★ 2UMU6182024-04-17CandidatePoC-in-GitHub · wusijie/CVE-2024-21338-1PoC for the Untrusted Pointer Dereference in the appid.sys driver★ 2wusijie2024-05-05CandidatePoC-in-GitHub · Zombie-Kaiser/CVE-2024-21338-x64-build-Local Privilege Escalation from Admin to Kernel vulnerability on Windows 10 and Windows 11 operating systems with HVCI enabled.★ 7Zombie-Kaiser2024-05-18CandidatePoC-in-GitHub · tykawaii98/CVE-2024-21338_PoC★ 40tykawaii982024-06-23CandidatePoC-in-GitHub · Crowdfense/CVE-2024-21338Windows AppLocker Driver (appid.sys) LPE★ 81Crowdfense2024-07-29CandidatePoC-in-GitHub · hackyboiz/kcfg-bypasskcfg bypass example - CVE-2024-21338★ 2hackyboiz2025-01-12CandidatePoC-in-GitHub · MistyFir/CVE-2024-21338-Exploit★ 8MistyFir2026-03-11CandidatePoC-in-GitHub · kikozz/CVE-2024-21338★ 0kikozz2026-09-30Candidate