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Keyword, CVE, vendor, product…

Exploitation

Exploited only1

Type

Incident1

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Critical1

Category

Vulnerability1

Status

Monitoring1

Region

North America1

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United States1

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Government1
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Web applications1

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Microsoft1

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Microsoft1
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Vulnerability exploitation1

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Unknown1

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Language / package ecosystem

.NET / C# (NuGet)1

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▲CriticalVulnerabilityMonitoringBackfillExploitedEPSS 100%CVE-2025-53770Jul 20, 2025· updated Nov 11

On July 20, 2025, CISA added CVE-2025-53770 ('ToolShell') in on-premises Microsoft SharePoint to its Known Exploited Vulnerabilities (KEV) catalog .

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CISA Adds SharePoint 'ToolShell' Vulnerability CVE-2025-53770 to Known Exploited Vulnerabilities Catalog