CVE-2020-1147 — Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Vulnerability
Overview
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.
Vulnerability details
- CVE ID
- CVE-2020-1147
- Vulnerability
- Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Vulnerability
- Vendor
- Microsoft
- Affected products
- Microsoft: .NET Framework, SharePoint, Visual Studio
- Severity
- HIGH
- Exploitation status
- Actively exploited in the wild (CISA KEV)
- Published
- 2021-11-03
Remediation guidance
CVE-2020-1147 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.
Apply the vendor's official security update for Microsoft the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.
Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.
Authoritative references
Remediate CVE-2020-1147 — and stay ahead of the next one
CVE-2020-1147 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2020-1147 and other Microsoft issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.
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