CVE-2025-53770

9.8 CRITICAL CISA KEV - Actively Exploited
Published: July 20, 2025 Modified: October 27, 2025
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770
Source: secure@microsoft.com
Vendor Advisory
https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Press/Media Coverage
https://github.com/kaizensecurity/CVE-2025-53770
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit
https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/
Source: af854a3a-2127-422b-91ae-364da2661108
Mitigation Vendor Advisory
https://news.ycombinator.com/item?id=44629710
Source: af854a3a-2127-422b-91ae-364da2661108
Issue Tracking
https://research.eye.security/sharepoint-under-siege/
Source: af854a3a-2127-422b-91ae-364da2661108
Exploit Mitigation Third Party Advisory
https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally
Source: af854a3a-2127-422b-91ae-364da2661108
Press/Media Coverage
https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/
Source: af854a3a-2127-422b-91ae-364da2661108
Press/Media Coverage
https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing List Third Party Advisory US Government Resource
https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw
Source: af854a3a-2127-422b-91ae-364da2661108
Press/Media Coverage
https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/
Source: af854a3a-2127-422b-91ae-364da2661108
Press/Media Coverage
https://x.com/Shadowserver/status/1946900837306868163
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
US Government Resource

13 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.8 / 10.0
EPSS (Exploit Probability)
90.1%
100th percentile
Exploitation Status
Actively Exploited
Remediation due: 2025-07-21

Weaknesses (CWE)

CWE-502

Affected Vendors

microsoft

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