Windows Installer Elevation of Privilege Vulnerability
CVE-2021-41379 is a local privilege escalation vulnerability in Microsoft Windows Installer. The provided content identifies it as a Windows Installer elevation of privilege issue and indicates it has been abused via DLL side-loading behavior involving msi.dll. The content further states that analysis of the patch for CVE-2021-41379 led researchers to identify a related locally exploitable Windows issue affecting systems with the AppX Installer/Elevation service enabled, and that a reliable proof-of-concept was published. Based on the supplied material, exploitation involves local abuse of Windows installer-related components to execute arbitrary code with elevated privileges, but the specific vulnerable function or code path is not provided in the source content.
Are you exposed to this one?
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Windows local privilege escalation vulnerability frequently used by Makop operators to obtain elevated/SYSTEM privileges.
A Windows Installer-related vulnerability associated here with msi.dll hijacking/loading behavior that could enable arbitrary code execution, privilege escalation, or persistence.
Windowsin Elevation service -palveluun liittyvä paikallinen haavoittuvuus, joka mahdollistaa mielivaltaisen koodin suorittamisen korotetuilla oikeuksilla. Haavoittuvuus havaittiin CVE-2021-41379:n korjauksen analysoinnin yhteydessä; hyväksikäyttöä on havaittu ja toimiva PoC on julkaistu, mutta korjaavaa päivitystä ei ole saatavilla.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.