CVE-2020-0646
CriticalExploitedPublic exploitA remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.
Published Jan 14, 2020 · Updated Oct 29, 2025
Key Facts
Patch immediately- CVE-2020-0646 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting .net Framework (Microsoft), Microsoft .NET Framework 3.0, Microsoft .NET Framework 3.5 and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021. Public exploit code is available.
- EPSS estimates a 99% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
99%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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'.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| Industry KEV feed | Nov 3, 2021 | May 3, 2022 | Not reported |
| CIRCL KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
63 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| .net FrameworkMicrosoft | 3.0-sp2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7 | n/a |
| Microsoft .NET Framework 3.0 | >= Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2 | n/a |
| Microsoft .NET Framework 3.5 | >= Windows 10 Version 1607 for 32-bit Systems | n/a |
| Microsoft .NET Framework 3.5.1 | >= Windows 7 for 32-bit Systems Service Pack 1 | n/a |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems | >= unspecified | n/a |
Timeline
Publicly disclosed
Jan 14, 2020
Added to CISA KEV
Nov 3, 2021
Added to Industry KEV feed
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Oct 29, 2025
Weakness Type
- CWE-91 XML Injection (aka Blind XPath Injection)
References
- patchhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646
- exploithttp://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html
- exploitMSF sharepoint_workflows_xoml.rb
- exploitVulnCheck exploitation report
- exploitExploitDB-48275
FAQ
Common Questions.
A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.
Affected: .net Framework (Microsoft) versions 3.0-sp2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7; Microsoft .NET Framework 3.0 versions >= Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2; Microsoft .NET Framework 3.5 versions >= Windows 10 Version 1607 for 32-bit Systems, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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