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SharePoint

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CVE-2025-53770 and CVE-2025-53771 Abused in Active Attacks on On-Prem SharePoint
Vulnerabilities

CVE-2025-53770 and CVE-2025-53771 Abused in Active Attacks on On-Prem SharePoint

Threat Group: Linen Typhoon, Violet Typhoon, Storm-2603 Threat Type: Remote Code Execution & Spoofing Exploited Vulnerabilities: CVE-2025-53770 (RCE), CVE-2025-53771 (Spoofing) Malware Used: ToolShell (spinstall0.aspx) Threat Score: 🔴 High (8.0/10) – Active exploitation by nation-state actors, persistent access via cryptographic theft, and potential lateral movement across enterprise networks. Last Threat
Jul 22, 2025 5 min read
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