CVE-2021-43883

HIGH

Windows Installer - Privilege Escalation

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-43883. PoCs published by jbaines-r7.

AI-analyzed exploit summary This is a minimized proof-of-concept for CVE-2021-43883, demonstrating arbitrary file creation via a race condition in the Windows Installer. It does not execute shellcode but proves the vulnerability by copying itself to a target path.

Description

Windows Installer Elevation of Privilege Vulnerability

Exploits (1)

nomisec WORKING POC 79 stars
by jbaines-r7 · poc
https://github.com/jbaines-r7/shakeitoff

This is a minimized proof-of-concept for CVE-2021-43883, demonstrating arbitrary file creation via a race condition in the Windows Installer. It does not execute shellcode but proves the vulnerability by copying itself to a target path.

Classification
Working Poc 95%
Attack Type
Lpe
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Windows Installer
Auth required
Prerequisites: Valid MSI file · Empty directory with trailing backslash · Target file path
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 7.8
EPSS 0.1196
EPSS Percentile 95.6%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

Status published
Products (20)
microsoft/windows_10 (2 CPE variants)
microsoft/windows_10 20h2 (3 CPE variants)
microsoft/windows_10 21h1 (3 CPE variants)
microsoft/windows_10 21h2 (3 CPE variants)
microsoft/windows_10 1607 (2 CPE variants)
microsoft/windows_10 1809 (3 CPE variants)
microsoft/windows_10 1909 (3 CPE variants)
microsoft/windows_10 2004 (3 CPE variants)
microsoft/windows_11 (2 CPE variants)
microsoft/windows_7 (2 CPE variants)
... and 10 more
Published Dec 15, 2021
Tracked Since Feb 18, 2026