In CISA KEV9.8 CriticalCWE-502Ransomware use
CVE-2025-53770
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
MicrosoftSharePoint
Status
- Exploited in the wild
- In CISA KEV since 20 Jul 2025
- Vendor fix available
- Known ransomware use
Federal deadlineMon 21 Jul 2025, 23:59 UTC
Passed 460 days ago
CISA KEV · added 20 Jul 2025
Exploit probabilityEPSSchecked 25 Oct
99.9%probability of exploitation in the next 30 days
Higher than 100% of scored CVEs
SeverityCVSS
9.8Critical
Description NVD
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.
CISA required action
Disconnect 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.
Coverage 3 articles · 3 outlets
See the full timelineShow as table
| Published (UTC) | Outlet | Headline |
|---|---|---|
| Tue 10 Mar · 12:22 UTC | The Hacker News | SharePoint CVE-2025-53770 highlights value of shrinking exposure |
| Tue 17 Mar · 16:14 UTC | Dark Reading | Warlock Ransomware Group Augments Post-Exploitation Activities |
| Mon 23 Mar · 15:10 UTC | SecurityWeek | M-Trends 2026: Initial Access Handoff Shrinks From Hours to 22 Seconds |
- M-Trends 2026: Initial Access Handoff Shrinks From Hours to 22 SecondsSecurityWeek · mentions it in passing
- Warlock Ransomware Group Augments Post-Exploitation ActivitiesDark Reading · mentions it in passing
- SharePoint CVE-2025-53770 highlights value of shrinking exposureThe Hacker News · first in our coverage