CVE-2020-1066: Microsoft .NET Framework

High severity, CVSS 7.8. EPSS: 2.5% chance of exploitation in the next 30 days.

An elevation of privilege vulnerability exists in .NET Framework which could allow an attacker to elevate their privilege level. To exploit the vulnerability, an attacker would first have to access the local machine, and then run a malicious program. The update addresses the vulnerability by correcting how .NET Framework activates COM objects.

Affected products

• Microsoft .NET Framework: version 3.0 only; version 3.5.1 only

Published 2020-05-21. Last modified 2026-08-19.