CVE-2025-53770Microsoft SharePoint Server Remote Code Execution Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft SharePoint Enterprise Server 2016 and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jul 20, 2025; federal agencies had to remediate by Jul 21, 2025, and it is known to be used in ransomware. Treat that date as your deadline.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/RC:C
- Weakness (CWE)
- CWE-502
- Known exploited
- Added to CISA KEV Jul 20, 2025; federal remediation due Jul 21, 2025; known ransomware useDisconnect 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.
- EPSS (exploitation in the next 30 days)
- 100.00% (percentile 100)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Aug 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft SharePoint Enterprise Server 2016 microsoft:sharepoint_enterprise_server_2016 (from the name) | from 16.0.0 before 16.0.5513.1001 | CNA record |
Microsoft Microsoft SharePoint Server 2019 microsoft:sharepoint_server_2019 (from the name) | from 16.0.0 before 16.0.10417.20037 | CNA record |
Microsoft Microsoft SharePoint Server Subscription Edition microsoft:sharepoint_server_subscription_edition (from the name) | from 16.0.0 before 16.0.18526.20508 | CNA record |
microsoft sharepoint_server microsoft:sharepoint_server | before 16.0.18526.20508; 2016; 2019 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770vendor-advisory, patch
- 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-2025-53770exploit
- https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/mitigation, vendor-advisory
- https://news.ycombinator.com/item?id=44629710issue-tracking
- https://research.eye.security/sharepoint-under-siege/exploit, mitigation, third-party-advisory
- https://therecord.media/microsoft-sharepoint-zero-day-vulnerability-exploited-globallypress/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-2025-53770mailing-list, third-party-advisory, us-government-resource
- https://www.darkreading.com/remote-workforce/microsoft-rushes-emergency-fix-exploited-sharepoint-toolshell-flawpress/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/1946900837306868163third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-53770us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.