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Fencer Intel
critical 9.8

CVE-2025-53770 kev+ ransomware in the critical feed json

Microsoft SharePoint Server Remote Code Execution Vulnerability

published last yr. modified 3mo ago also EUVD-2025-23309

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2025-07-20, used in ransomware
epss
100.0%
EPSS 100.0% chance of exploitation in 30 days, percentile 99.9%
public exploits
2
Metasploit and Exploit-DB, plus a Nuclei check

Summary

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.

Patch / fix

cisa required action Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.

  • Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.5513.1001
  • Microsoft Microsoft SharePoint Server 2019 16.0.10417.20037
  • Microsoft Microsoft SharePoint Server Subscription Edition 16.0.18526.20508

Is CVE-2025-53770 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. First public exploit (Metasploit exploit/windows/http/sharepoint_toolpane_rce)
  2. 0-day patched (Project Zero)
  3. CISA SSVC: exploitation active
  4. Added to CISA KEV
  5. Published
  6. CISA patch deadline

Known exploited

Added
last yr.
Patch by
2025-07-21 (last yr.)
Ransomware
Known to be used in ransomware campaigns
Required action
Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Vendor, product
Microsoft, SharePoint
CISA name
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched
2025-07-19
Details
project zero tracker

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1059 Command and Scripting Interpreter exploitation
  • T1190 Exploit Public-Facing Application exploitation

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

100.00% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Metasploit exploit/windows/http/sharepoint_toolpane_rce Microsoft SharePoint Server ToolPane Unauthenticated Remote Code Execution (aka ToolShell) metasploit exploit, excellent rank, 2025-07-08
  • EDB-52405 Microsoft SharePoint Server 2019 (16.0.10383.20020) - Remote Code Execution (RCE) remote, 2025-08-11
  • Nuclei template Microsoft SharePoint Server - Remote Code Execution (ToolShell) nuclei detection template
  • research.eye.security https://research.eye.security/sharepoint-under-siege/ referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/kaizensecurity/CVE-2025-53770 referenced PoC, tagged "exploit" by a source, unverified
  • arstechnica.com https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/RC:C
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Microsoft Microsoft SharePoint Enterprise Server 2016
  • Microsoft Microsoft SharePoint Server 2019
  • Microsoft Microsoft SharePoint Server Subscription Edition

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.