CVE-2020-0646VulnerabilityPublished 11/03/2021Updated 10/24/2026

CVE-2020-0646: Microsoft .NET Framework Remote Code Execution Vulnerability

Affects Microsoft .NET FrameworkSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 11/03/2021
KEV deadline: 05/03/2022
EPSS: 99.2% chance of exploitation in 30 days – higher than 99% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2020-0646 (opens in a new tab)

Description

CVE-2020-0646 is a remote code execution vulnerability in Microsoft .NET Framework caused by improper input validation. This flaw allows attackers to execute arbitrary code remotely. It has been exploited in the wild, indicating active threat usage. The vulnerability is classified as high severity due to its potential impact on affected systems.

Summary

Microsoft .NET Framework contains an improper input validation vulnerability (CWE-91) that enables remote code execution. This vulnerability has been observed to be exploited in the wild, highlighting its practical risk. No specific affected versions or patch information is provided in the input data. The vulnerability allows attackers to execute arbitrary code remotely by leveraging the input validation flaw.

Impact

Successful exploitation of this vulnerability allows remote attackers to execute arbitrary code on affected systems running Microsoft .NET Framework. This can lead to full system compromise depending on the privileges of the exploited process. The vulnerability has been exploited in the wild, confirming active threat usage.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official remediation information is provided, users should monitor Microsoft advisories for updates and apply any released fixes promptly.

Weaknesses

CWE-91XML Injection (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 09:10:44 UTC

Weaknesses

References

Related threats