CVE-2020-0646

CRITICALNVD 9.89.8—

9.8

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 v3: 9.8
EG Score: 9.8(high)
EPSS: 99.9%
KEV: ⚠ Exploited

Published

January 14, 2020

Last Modified

October 29, 2025

References (5)

secure@microsofthttp://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html
secure@microsofthttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html
af854a3a-2127-422b-91ae-364da2661108https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0646

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2020-06462020-01-14
.NET Framework Remote Code Execution Injection Vulnerability

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-26 19:18 UTCEG score recompute
2026-05-26 19:18 UTCVendor advisory
2026-05-26 19:18 UTCGHSA enrichment
2026-05-26 19:13 UTCkev_newly_listed
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(6)

What is CVE-2020-0646?

CVE-2020-0646 is a critical vulnerability published on January 14, 2020. A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.

When was CVE-2020-0646 disclosed?

CVE-2020-0646 was first published in the National Vulnerability Database on January 14, 2020, with the most recent update on October 29, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-0646 actively exploited?

Yes. CISA added CVE-2020-0646 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Microsoft .NET Framework. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2020-0646?

CVE-2020-0646 has a CVSS v3 base score of 9.8 (NVD).

Which products are affected by CVE-2020-0646?

CVE-2020-0646 affects Microsoft .NET Framework. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2020-0646?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-0646, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-0646

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