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CVE-2021-41379 is a local elevation of privilege vulnerability in Microsoft Windows Installer. Available reporting indicates the flaw can be abused locally to obtain elevated execution, and public discussion around exploitation ties it to abuse of the Windows Installer elevation service and replacement or side-loading behavior involving the service binary. The vulnerability was significant not only because it enabled privilege escalation, but also because the initial vendor fix was reported as incomplete, after which a reliable proof-of-concept and in-the-wild exploitation were discussed. The issue affects Windows systems where the relevant elevation service functionality is present and exposed to a local attacker.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
4 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.
A local privilege escalation vulnerability in Microsoft Windows for which the content says an exploit exists and that mitigations are limited.
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.