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Exploited vulnerability · CISA KEV

Is CVE-2025-53770 exploited? Yes: in CISA KEV since 20 Jul 2025

Gociux · Microsoft SharePoint · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-53770, Microsoft SharePoint Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 20 Jul 2025, the day it was published. It is known to be used in ransomware campaigns. It affects Microsoft SharePoint. If you run it, CISA's required action is: 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.

exploitedYesCISA KEV · 20 Jul 2025
ransomwareKnownused in campaigns
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due21 Jul 2025BOD 22-01 deadline

What it is

Microsoft SharePoint Server on-premises contains a deserialization of untrusted data vulnerability that could allow an unauthorized attacker to execute code over a network. This vulnerability could be chained with CVE-2025-53771. CVE-2025-53770 is a patch bypass for CVE-2025-49704, and the updates for CVE-2025-53770 include more robust protection than those for CVE-2025-49704.

VendorMicrosoft (391 exploited CVEs in KEV)
ProductSharePoint
VulnerabilityMicrosoft SharePoint Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published20 Jul 2025
Added to KEV20 Jul 2025
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for SharePoint in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. 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.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 20 Jul 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in SharePoint

References

Questions

Is CVE-2025-53770 being exploited?

Yes. CISA added CVE-2025-53770 to the Known Exploited Vulnerabilities catalog on 20 Jul 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-53770 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2025-53770?

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. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected SharePoint and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in July 2025 · Microsoft scorecard · act-now radar.

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