Microsoft SharePoint Server Remote Code Execution Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-53770
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-07-20 01:15:30 UTC
Updated2026-08-04 05:16:34 UTC
DescriptionDeserialization 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.999820000 probability, percentile 0.999810000 (date 2026-08-16)

CISA KEV: Listed on 2025-07-20; due 2025-07-21; ransomware use Known

Problem Types: CWE-502 | CWE-502 CWE-502: Deserialization of Untrusted Data

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

VendorMicrosoft
ProductSharePoint
NameMicrosoft SharePoint Deserialization of Untrusted Data Vulnerability
Required ActionDisconnect 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.
NotesCISA Mitigation Instructions: https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770; https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/ ; https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53770

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft Sharepoint Server All All All All
Application Microsoft Sharepoint Server 2016 All All All
Application Microsoft Sharepoint Server 2019 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Microsoft SharePoint Enterprise Server 2016 affected 16.0.0 16.0.5513.1001 custom x64-based Systems
CNA Microsoft Microsoft SharePoint Server 2019 affected 16.0.0 16.0.10417.20037 custom x64-based Systems
CNA Microsoft Microsoft SharePoint Server Subscription Edition affected 16.0.0 16.0.18526.20508 custom x64-based Systems

References

ReferenceSourceLinkTags
github.com/kaizensecurity/CVE-2025-53770 af854a3a-2127-422b-91ae-364da2661108 github.com Exploit
x.com/Shadowserver/status/1946900837306868163 af854a3a-2127-422b-91ae-364da2661108 x.com Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
news.ycombinator.com/item af854a3a-2127-422b-91ae-364da2661108 news.ycombinator.com Issue Tracking
msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 [email protected] msrc.microsoft.com Vendor Advisory
therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally af854a3a-2127-422b-91ae-364da2661108 therecord.media Press/Media Coverage
www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exp... af854a3a-2127-422b-91ae-364da2661108 www.cisa.gov Mailing List, Third Party Advisory, US Government Resource
arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-r... af854a3a-2127-422b-91ae-364da2661108 arstechnica.com Exploit, Press/Media Coverage
research.eye.security/sharepoint-under-siege af854a3a-2127-422b-91ae-364da2661108 research.eye.security Exploit, Mitigation, Third Party Advisory
msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-c... af854a3a-2127-422b-91ae-364da2661108 msrc.microsoft.com Mitigation, Vendor Advisory
www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sha... af854a3a-2127-422b-91ae-364da2661108 www.darkreading.com Press/Media Coverage
www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-... af854a3a-2127-422b-91ae-364da2661108 www.forbes.com Press/Media Coverage
www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce... af854a3a-2127-422b-91ae-364da2661108 www.bleepingcomputer.com Press/Media Coverage
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Additional Advisory Data

SourceTimeEvent
ADP2025-07-20T00:00:00.000ZCVE-2025-53770 added to CISA KEV

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