CVE-2025-53770
Microsoft SharePoint Server Remote Code Execution Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 20 Jul 2025
- Used in ransomware campaigns
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.
Key facts
- Published
- 20 Jul 2025
- Last changed
- 4 Aug 2026
- Assigned by
- microsoft
- KEV added
- 20 Jul 2025
- KEV fix due
- 21 Jul 2025
- Used in ransomware
- Yes, according to CISA
- EPSS
- 99.999% likely to be exploited in the next 30 days, higher than 99.991% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom the CNA (microsoft)
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
What to do
- 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.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 |
|
| Microsoft | Microsoft SharePoint Server 2019 |
|
| Microsoft | Microsoft SharePoint Server Subscription Edition |
|
Timeline
- 20 Jul 2025 CVE-2025-53770 added to CISA KEV
- 20 Jul 2025 Added to the CISA KEV catalogue
- 20 Jul 2025 Published