CVE-2025-53770
criticalpriority · act · 90OT risk · criticalKEV · exploitedEU KEV · CNWEPSS 1.000 · 100 %ileexploit · weaponizedDEEUNLRUUSadded 2025-07-20remediate by 2025-07-21
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.
EU KEVflagged by CNWreported 2026-04-08patched 2025-07-19APT
Microsoft confirmation of active attacks targeting on-premises SharePoint Server customers by exploiting vulnerabilities partially addressed by the July Security Update.
EPSS · scored 2026-10-26
Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
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.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedMicrosoft SharePoint Enterprise Server 2016msrc_csaf
16.0.5513.1001:Security Update:https://support.microsoft.com/help/5002759
https://support.microsoft.com/help/5002759 - FixedMicrosoft SharePoint Server 2019msrc_csaf
16.0.10417.20037:Security Update:https://support.microsoft.com/help/5002753
https://support.microsoft.com/help/5002753 - FixedMicrosoft SharePoint Server Subscription Editionmsrc_csaf
16.0.18526.20508:Security Update:https://www.microsoft.com/en-us/download/details.aspx?id=108285
https://www.microsoft.com/en-us/download/details.aspx?id=108285
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
ATT&CK techniques
ATT&CK techniques this enables or maps to.
exploits (47)
Public proof-of-concept and weaponised exploit code.
- 3a7/CVE-2025-53770CVE-2025-53770 Mass ScannerPoC · poc_in_github
affected products (30)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- NCSC-2025-0233Zeroday-kwetsbaarheden ontdekt in Microsoft SharePoint ServerNL2025-07-20csaf · ncsc_nlNL
Microsoft heeft informatie vrijgegeven over actief misbruikte zeroday-kwetsbaarheden in on-premises versies van Microsoft SharePoint Server. Sharepoint Online (onderdeel van Microsoft 365) is niet getroffen.
- WID-SEC-W-2025-1598Microsoft SharePoint (On-premises): Mehrere SchwachstellenDeutsch2025-07-20csaf · cert_bundDE
Ein entfernter anonymer oder authentifizierter Angreifer kann mehrere Schwachstellen in Microsoft SharePoint Server 2019, Microsoft SharePoint Subscription Edition und Microsoft SharePoint Server 2016 ausnutzen, um beliebigen Code auszuführen und Spoofing-Angriffe durchzuführen.
- msrc_CVE-2025-53770Microsoft SharePoint Server Remote Code Execution Vulnerability2025-07-08csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (16)
External citations — patches, advisories, analysis.
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770cnnvd
- https://www.exploit-db.com/exploits/52405cnnvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770enisa_euvd
- https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe/ExploitPress/Media Coveragenvd
- https://github.com/kaizensecurity/CVE-2025-53770Exploitnvd
- https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770/MitigationVendor Advisorynvd
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770Vendor Advisorynvd
- https://news.ycombinator.com/item?id=44629710Issue Trackingnvd
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