CVE-2020-1147
CISA KEVPublished November 3, 2021 · Updated April 3, 2026
high
Official Description+
Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio contain a remote code execution vulnerability when the software fails to check the source markup of XML file input. Successful exploitation allows an attacker to execute code in the context of the process responsible for deserialization of the XML content.
Affected Products
| Vendor | Product |
|---|---|
| Microsoft | .NET Framework, SharePoint, Visual Studio |
Patch Status
Patch by 2022-05-03
Recommended Actions
- Check if your systems use any of the affected products listed above.
- Apply vendor patches immediately if available.
- This vulnerability is in CISA's Known Exploited Vulnerabilities catalog — prioritize remediation.
- Monitor vendor advisories for updates and additional mitigations.
- Review logs for indicators of compromise related to CVE-2020-1147.