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CVE-2021-41379 is a local elevation of privilege vulnerability in Microsoft Windows Installer. Available reporting indicates the issue can be abused through Windows Installer-related behavior involving DLL side-loading and overwrite of an elevation service component, allowing a low-privileged local attacker to trigger execution in a higher-privileged context. Public discussion around the flaw also noted that the initial vendor patch was insufficient, and exploitation activity as well as proof-of-concept exploit code were reported. The vulnerability affects Windows systems where the relevant elevation service functionality is present and can be leveraged to execute attacker-controlled code with elevated privileges.
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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.