CVE-2020-1066

7.8 highEPSS 2.5%

High (7.8) in microsoft .net framework. 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.

Severity

CVSS 3.1

7.8 high

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 2.5% chance of exploitation in the next 30 days; higher than 84% of CVEs (scores of 2026-10-31)
Published: 2020-05-21
Modified: 2026-08-19
Record from: the NVD, synced 2026-10-19

Affected

microsoft:.net_framework

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1066
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1066

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