Vulnerability Monitor

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CVE-2025-53770

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.

Published

2025-07-20T01:15:30.777

Last Modified

2025-10-27T17:12:40.607

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

Weaknesses

Type: Secondary
CWE-502

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	microsoft	sharepoint_server	< 16.0.18526.20508	Yes
Application	microsoft	sharepoint_server	2016	Yes
Application	microsoft	sharepoint_server	2019	Yes

References

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