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ExploitedIn CISA KEVFix available

CVE-2020-0646

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-01-14
  • WeaknessCWE-91

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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'.

Timeline

dates in UTC
  1. 2020-01-1423:15CVE publishedNVD
  2. 2020-03-31Exploit-DB entryExploit-DB
  3. 2021-11-03Added to the CISA KEV catalogCISA KEV
  4. 2021-11-03Listed as exploited by GCVEGCVE
  5. 2021-11-03Exploitation first reportedCISA KEV
  6. 2025-02-0715:18SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 03:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-0646?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-0646?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Microsoft .net frameworkversion to verify
BranchAffectedFixed in
3.0= 3.0no fix published
3.5= 3.5no fix published
4.6= 4.6.2no fix published
4.7= 4.7no fix published
4.7= 4.7.1no fix published
4.7= 4.7.2no fix published
4.8= 4.8no fix published
3.5= 3.5.1no fix published
4.5= 4.5.2no fix published
4.6= 4.6no fix published
4.6= 4.6.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA52 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2
    Affected
    • = Windows 7 for 32-bit Systems Service Pack 1no fix stated
    • = Windows 7 for x64-based Systems Service Pack 1no fix stated
    • = Windows 8.1 for 32-bit systemsno fix stated
    • = Windows 8.1 for x64-based systemsno fix stated
    • = Windows RT 8.1no fix stated
    • = Windows Server 2008 R2 for x64-based Systems Service Pack 1no fix stated
    • = Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)no fix stated
    • = Windows Server 2012no fix stated

    3 more version lines in the CVE record.

  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
    Affected
    • = Windows 10 Version 1607 for 32-bit Systemsno fix stated
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems
  • Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems

46 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-03-26

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-05-03

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-48275
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
1 moduleexploit/windows/http/sharepoint_workflows_xomlrank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2021-11-03
Patch Due Date
2022-05-03
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-01-14
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-4w3v-83v8-mg94

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'.

Is CVE-2020-0646 actively exploited?

Yes. CVE-2020-0646 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

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

CVE-2020-0646 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record