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CVE-2020-0646

CRITICAL9.8
CISA KEV

Published 2020-01-14 · Updated 2026-06-17 · Source secure@microsoft.com

Summary

CVE-2020-0646 is a critical-severity (CVSS 9.8) vulnerability in Microsoft .NET Framework. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.

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

CWE-91CWE-91

CISA Known-Exploited Vulnerability

Product: Microsoft — .NET Framework

Name: Microsoft .NET Framework Remote Code Execution Vulnerability

Date added: 2021-11-03 · Due: 2022-05-03

Required action: Apply updates per vendor instructions.

View on NVD