CVE-2020-0646

Name: CVE-2020-0646
Creator: NVD / NIST
Published: 2020-01-14T23:15:33.143+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 99.19%

Last modified Jun 17, 2026

CVE-2020-0646 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.19% chance of exploitation in the next 30 days.

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'.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

99.19%

99.9th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Microsoft	.Net Framework	3.0	Sp2
Microsoft	.Net Framework	3.5	—
Microsoft	.Net Framework	4.6.2	—
Microsoft	.Net Framework	4.7	—
Microsoft	.Net Framework	4.7.1	—
Microsoft	.Net Framework	4.7.2	—
Microsoft	.Net Framework	4.8	—
Microsoft	.Net Framework	3.5.1	—
Microsoft	.Net Framework	4.5.2	—
Microsoft	.Net Framework	4.6	—
Microsoft	.Net Framework	4.6.1	—

References

http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646Patch, Vendor Advisory
http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.htmlExploit, Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646Patch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0646US Government Resource

Timeline

Published: Jan 14, 2020
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2020-0646?

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

How severe is CVE-2020-0646?

CVE-2020-0646 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 99.19% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2020-0646?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-0646?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST