Is CVE-2025-53770 actively exploited?

Yes. KEV Intelligence tracks CVE-2025-53770 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2025-53770. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2025-53770 affects Microsoft Microsoft SharePoint Enterprise Server 2016 and 2 other products. Reported affected versions include 16.0.0 to < 16.0.5513.1001, 16.0.0 to < 16.0.10417.20037, and 16.0.0 to < 16.0.18526.20508.

Yes. CVE-2025-53770 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

CVE-2025-53770 Exploited in the Wild — Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2025-53770 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-53770 is an unauthenticated Microsoft SharePoint Server Remote Code Execution Vulnerability. Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Microsoft SharePoint Enterprise Server 2016 affected before 16.0.5513.1001.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Microsoft SharePoint Server Remote Code Execution Vulnerability

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.

Vendor Product Affected Status

Microsoft Microsoft SharePoint Enterprise Server 2016 Before 16.0.5513.1001 Affected

Microsoft Microsoft SharePoint Server 2019 Before 16.0.10417.20037 Affected

Microsoft Microsoft SharePoint Server Subscription Edition Before 16.0.18526.20508 Affected

View vendor advisory

Published: 20 Jul 2025
Exploitation Reported: 01 Jun 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-53770
Microsoft SharePoint Server Remote Code Execution Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Used in malware

CVE

Recorded 02 Jun 2026

Malware families have been linked to exploitation of this CVE.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
CVE First	2026-06-01 10:37 UTC
The Shadowserver	2026-06-02 00:00 UTC
CISA	2026-06-02 14:06 UTC
Daily CyberSecurity	2026-06-11 01:20 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

Nuclei template detected 01 Jun 2026.

View Nuclei template

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-53770.yaml	01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

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

EPSS

100.0%

Weaknesses

Deserialization of Untrusted Data CWE-502

Recent mention · Daily CyberSecurity

Millions at Risk: 9.8 CVSS Remote Code Execution in HTTP.sys

The tech world faces a severe threat today. Millions of users are currently at risk due to a The post Millions at Risk: 9.8 CVSS Remote Code Execution in HTTP.sys appeared first on Daily CyberSecurity. Related posts: FiberGateway Router Hacked: Portugal’s 1.6M Homes at...

Read full advisory

All Mentions

Recent mention · Daily CyberSecurity

Millions at Risk: 9.8 CVSS Remote Code Execution in HTTP.sys

Daily CyberSecurity · 12 Jun 2026

The tech world faces a severe threat today. Millions of users are currently at risk due to a The post Millions at Risk: 9.8 CVSS Remote Code Execution in HTTP.sys appeared first on Daily CyberSecurity. Related posts: FiberGateway Router Hacked: Portugal’s 1.6M Homes at Risk Critical HIKVISION applyCT Flaw (CVE-2025-34067, CVSS 10.0): Unauthenticated RCE Via Fastjson SharePoint Server Under Active Zero-Day Attack (CVE-2025-53770, CVSS 9.8), No Patch Yet!

Recent mention · Daily CyberSecurity

Splunk Enterprise Vulnerabilities: Patch CVSS 9.8 Flaws

Daily CyberSecurity · 11 Jun 2026

Security administrators must urgently patch multiple critical Splunk Enterprise vulnerabilities recently disclosed by the vendor. These highly severe The post Splunk Enterprise Vulnerabilities: Patch CVSS 9.8 Flaws appeared first on Daily CyberSecurity. Related posts: High-Privilege Havoc: Splunk Patches RCE Flaw Lurking in File Previews AI Spam Threatens cURL’s Bug Bounty Program: Developer Considers Shutting It Down SharePoint Server Under Active Zero-Day Attack (CVE-2025-53770, CVSS 9.8), No Patch Yet!

Recent mention · Daily CyberSecurity

Spring Data Vulnerabilities: Patch Five Critical Flaws Now

Daily CyberSecurity · 11 Jun 2026

Cybersecurity experts recently disclosed five severe Spring Data vulnerabilities. Consequently, software developers must act quickly to secure their The post Spring Data Vulnerabilities: Patch Five Critical Flaws Now appeared first on Daily CyberSecurity. Related posts: AI Spam Threatens cURL’s Bug Bounty Program: Developer Considers Shutting It Down SharePoint Server Under Active Zero-Day Attack (CVE-2025-53770, CVSS 9.8), No Patch Yet! CISA Alert: Actively Exploited Zero-Days in CrushFTP, Chrome, and SysAid Added to KEV Catalog

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Microsoft SharePoint Server - Remote Code Execution (ToolShell)

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

12 Jun 2026
Public PoC available

Public proof-of-concept code published
11 Jun 2026
KEV confirmed by Daily CyberSecurity

Exploitation attested by an external source
02 Jun 2026
First public exploitation report

Exploit observed in malware
02 Jun 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
02 Jun 2026
KEV confirmed by The Shadowserver

Exploitation attested by an external source
01 Jun 2026
Nuclei template available

Scanner coverage available
01 Jun 2026
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
20 Jul 2025
CVE published

Vulnerability disclosed publicly
09 Jul 2025
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-53770

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2025-53770",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.99982,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2025-53770

What security teams need to know first

Microsoft SharePoint Server Remote Code Execution Vulnerability

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Used in malware

Proof of concept available

Known exploited vulnerability sources

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Scanner Artifacts

Severity, weaknesses, and research context

Weaknesses

Millions at Risk: 9.8 CVSS Remote Code Execution in HTTP.sys

All Mentions

Potential Proof of Concepts

From disclosure to observed exploitation

Public PoC available

KEV confirmed by Daily CyberSecurity

First public exploitation report

Added to CISA KEV

KEV confirmed by The Shadowserver

Nuclei template available

Added to KEV Intelligence KEV Feed

CVE published

CVE ID reserved

Automate this intelligence

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