CVE-2025-53770

Known Exploited Public Exploit
Microsoft SharePoint Server Remote Code Execution Vulnerability

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
EPSS 69.38% Top 5%
KEV Since 
Vendor Advisory microsoft.com Vendor Advisory microsoft.com
Affected: Microsoft Microsoft SharePoint Enterprise Server 2016
Affected: Microsoft Microsoft SharePoint Server 2019
Affected: Microsoft Microsoft SharePoint Server Subscription Edition
Published at:
Updated at:

References

Link Tags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 vendor advisory
https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/ exploit press/media coverage
https://github.com/kaizensecurity/CVE-2025-53770 exploit
https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/ mitigation vendor advisory
https://news.ycombinator.com/item?id=44629710 issue tracking
https://research.eye.security/sharepoint-under-siege/ exploit mitigation third party advisory
https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globally press/media coverage
https://www.bleepingcomputer.com/news/microsoft/microsoft-sharepoint-zero-day-exploited-in-rce-attacks-no-patch-available/ press/media coverage
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
https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flaw press/media coverage
https://www.forbes.com/sites/daveywinder/2025/07/20/microsoft-confirms-ongoing-mass-sharepoint-attack---no-patch-available/ press/media coverage
https://x.com/Shadowserver/status/1946900837306868163 third party advisory

Frequently Asked Questions

What is the severity of CVE-2025-53770?
CVE-2025-53770 has been scored as a critical severity vulnerability.
How to fix CVE-2025-53770?
To fix CVE-2025-53770, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-53770 being actively exploited in the wild?
It is confirmed that CVE-2025-53770 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~69% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-53770?
CVE-2025-53770 affects Microsoft Microsoft SharePoint Enterprise Server 2016, Microsoft Microsoft SharePoint Server 2019, Microsoft Microsoft SharePoint Server Subscription Edition.
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