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CVE-2025-53770— Microsoft SharePoint Server Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft SharePoint Enterprise Server 2016
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft SharePoint Server是美国微软（Microsoft）公司的一款协作平台。 Microsoft SharePoint Server存在安全漏洞，该漏洞源于反序列化不受信任数据，可能导致远程代码执行。

CVSS 9.8 · Critical KEV · Ransomware EPSS 100.00% · P100

Affected Version Matrix 3

VendorProduct Version RangeStatus
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0< 16.0.5513.1001 affected
Microsoft Microsoft SharePoint Server 2019 16.0.0< 16.0.10417.20037 affected
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0< 16.0.18526.20508 affected
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I. Basic Information for CVE-2025-53770

Vulnerability Information
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Vulnerability Title
Microsoft SharePoint Server Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft SharePoint Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft SharePoint Server是美国微软（Microsoft）公司的一款协作平台。 Microsoft SharePoint Server存在安全漏洞，该漏洞源于反序列化不受信任数据，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0 ~ 16.0.5513.1001 -
Microsoft Microsoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20037 -
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.18526.20508 -

II. Public POCs for CVE-2025-53770

# POC Description Source Link Shenlong Link
1 Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. Microsoft is aware that an exploit for CVE-2025-53770 exists in the wild. Microsoft is preparing and fully testing a comprehensive update to address this vulnerability. In the meantime, please make sure that the mitigation provided in this CVE documentation is in place so that you are protected from exploitation. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53770.yaml POC Details
2 Detects a persistent webshell named 'spinstall0.aspx' deployed on Microsoft SharePoint servers. This file exposes sensitive cryptographic machineKey values from the SharePoint configuration, indicating the presence of a ToolShell backdoor implant. This implant is linked to targeted post-auth RCE campaigns exploiting CVE-2025-53770. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/backdoor/sharepoint-toolshell-backdoor.yaml POC Details
3 CVE-2025-53770 https://github.com/B1ack4sh/Blackash-CVE-2025-53770 POC Details
4 A critical zero-day vulnerability CVE‑2025‑53770 has been actively exploited in the wild against on-premises Microsoft SharePoint Server. Dubbed "ToolShell," this exploit leverages a deserialization flaw (variant of CVE‑2025‑49706, CVSS: 6.3). https://github.com/RukshanaAlikhan/CVE-2025-53770 POC Details
5 None https://github.com/Bluefire-Redteam-Cybersecurity/bluefire-sharepoint-cve-2025-53770 POC Details
6 This PowerShell script detects indicators of compromise for CVE-2025-53770 — a critical RCE vulnerability in Microsoft SharePoint. Created by @n1chr0x and @BlackRazer67 https://github.com/n1chr0x/ZeroPoint POC Details
7 POC https://github.com/kaizensecurity/CVE-2025-53770 POC Details
8 A comprehensive security monitoring solution for SharePoint Server with specific protection against CVE-2025-53770 and other threats https://github.com/paolokappa/SharePointSecurityMonitor POC Details
9 SharePoint WebPart Injection Exploit Tool https://github.com/soltanali0/CVE-2025-53770-Exploit POC Details
10 Scanner for the SharePoint CVE-2025-53770 RCE zero day vulnerability. https://github.com/hazcod/CVE-2025-53770 POC Details
11 ToolShell scanner - CVE-2025-53770 and detection information https://github.com/ZephrFish/CVE-2025-53770-Scanner POC Details
12 Hunting for Critical SharePoint Vulnerability CVE-2025-53770 https://github.com/siag-itsec/CVE-2025-53770-Hunting POC Details
13 Comprueba si un servidor SharePoint on-premises es vulnerable a CVE-2025-53770 https://github.com/grupooruss/CVE-2025-53770-Checker POC Details
14 None https://github.com/tripoloski1337/CVE-2025-53770-scanner POC Details
15 A critical zero-auth RCE vulnerability in SharePoint (CVE-2025-53770), now exploited in the wild, building directly on the spoofing flaw CVE-2025-49706. https://github.com/AdityaBhatt3010/CVE-2025-53770-SharePoint-Zero-Day-Variant-Exploited-for-Full-RCE POC Details
16 CVE-2025-53770 – Vulnerability Research & Exploitation https://github.com/b33b0y/CVE-2025-53770 POC Details
17 None https://github.com/GreenForceNetwork/Toolshell_CVE-2025-53770 POC Details
18 None https://github.com/imbas007/CVE-2025-53770-Vulnerable-Scanner POC Details
19 A Python-based reconnaissance scanner for safely identifying potential exposure to SharePoint vulnerability CVE-2025-53770. https://github.com/Sec-Dan/CVE-2025-53770-Scanner POC Details
20 Unauthenticated Remote Code Execution via unsafe deserialization in Microsoft SharePoint Server (CVE-2025-53770) https://github.com/MuhammadWaseem29/CVE-2025-53770 POC Details
21 Exploit tool for SharePoint WebPart Injection via ToolPane.aspx, enabling .NET deserialization and remote code execution. 🛠️🔍 Secure your SharePoint now! https://github.com/bijikutu/CVE-2025-53770-Exploit POC Details
22 Explore the Microsoft SharePoint CVE-2025-53770 proof of concept. Learn about this vulnerability and its implications. 🐙💻 https://github.com/Lapesha/CVE-2025-53770 POC Details
23 Scanner for CVE-2025-53770, a SharePoint vulnerability. Check if your server is vulnerable and extract version info. 🛠️🔍 https://github.com/Hassanopop/CVE-2025-53770 POC Details
24 Identify exposure to the critical SharePoint vulnerability CVE-2025-53770 with this effective scanner tool. Secure your systems today! 🛡️🔍 https://github.com/m4r1x/CVE-2025-53770-Scanner POC Details
25 Exploit & research for CVE‑2025‑53770 – a zero‑day remote code execution vulnerability in Microsoft SharePoint (on‑premises). https://github.com/Kamal-Hegazi/CVE-2025-53770-SharePoint-RCE POC Details
26 A sophisticated, wizard-driven Python exploit tool targeting CVE-2025-53770, a critical (CVSS 9.8) unauthenticated remote code execution (RCE) vulnerability in on-premises Microsoft SharePoint Server (2016, 2019, Subscription Edition) https://github.com/exfil0/CVE-2025-53770 POC Details
27 Scans Windows IIS logs for signs of CVE-2025-53770 & CVE-2025-53771 https://github.com/zach115th/ToolShellFinder POC Details
28 Detection rules for CVE-2025-53770 https://github.com/nisargsuthar/suricata-rule-CVE-2025-53770 POC Details
29 None https://github.com/bharath-cyber-root/sharepoint-toolshell-cve-2025-53770 POC Details
30 Do you really think SharePoint is safe? https://github.com/Rabbitbong/OurSharePoint-CVE-2025-53770 POC Details
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III. Intelligence Information for CVE-2025-53770

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IV. Related Vulnerabilities

Same product: Microsoft SharePoint Enterprise Server 2016
Same vendor: Microsoft
Same weakness: CWE-502

V. Comments for CVE-2025-53770

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