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CVE-2025-53770

CRITICALCISA KEV

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published7/20/2025

Last Modified10/27/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorMicrosoft

ProductSharePoint

Vulnerability NameMicrosoft SharePoint Deserialization of Untrusted Data Vulnerability

KEV Date Added2025-07-20

Remediation Due Date2025-07-21

Ransomware UseKnown

Affected Products

microsoft:sharepoint_server

Weaknesses (CWE)

CWE-502

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770(secure@microsoft.com)

https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/kaizensecurity/CVE-2025-53770(af854a3a-2127-422b-91ae-364da2661108)

https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/(af854a3a-2127-422b-91ae-364da2661108)

https://news.ycombinator.com/item?id=44629710(af854a3a-2127-422b-91ae-364da2661108)

https://research.eye.security/sharepoint-under-siege/(af854a3a-2127-422b-91ae-364da2661108)

https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally(af854a3a-2127-422b-91ae-364da2661108)

https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770(af854a3a-2127-422b-91ae-364da2661108)

https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw(af854a3a-2127-422b-91ae-364da2661108)

https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/(af854a3a-2127-422b-91ae-364da2661108)

https://x.com/Shadowserver/status/1946900837306868163(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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