Insecure library (DLL) loading in Eaton UPS Companion installer
CVE-2025-59887 is a high-severity vulnerability in the Eaton UPS Companion (EUC) software installer caused by improper authentication/validation of library files during load. The installer loads a required library (DLL) from an insecure/uncontrolled search path, enabling search-order hijacking (malicious DLL substitution) if an attacker can tamper with or place a crafted library alongside/in a searched directory for the installer. Successful exploitation results in arbitrary code execution in the context of the installer process. Eaton’s advisory indicates EUC versions prior to 3.0 are affected and that the issue was fixed in EUC 3.0 (published/fixed Dec 26, 2025).
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Exploits
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Recent activity
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A high-severity insecure library (DLL) loading issue in the Eaton UPS Companion installer that can enable arbitrary code execution if an attacker can tamper with or influence the software package/library search path.
Unknown
A high-severity improper authentication vulnerability in the Eaton UPS Companion software installer allows attackers with access to the software package to execute arbitrary code. The flaw is due to improper authentication of library files, leading to a risk of code execution during installation.
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Cross-references every affected SKU, including bundled OEM variants.
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