CVE-2025-53770

CRITICAL CISA KEV
Published Jul 20, 2025 Modified Oct 27, 2025 CWE-502

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.

CVSS v3.1 Score

9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Jul 20, 2025 Remediation due: Jul 21, 2025 Known ransomware use

Weakness Type (CWE)

CWE-502 Deserialization of Untrusted Data

Affected Products

Vendor Product
microsoft sharepoint_server
microsoft sharepoint_server
microsoft sharepoint_server

References

Frequently Asked Questions

What is CVE-2025-53770? +
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. It has a CVSS v3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2025-53770? +
CVE-2025-53770 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.
What products are affected by CVE-2025-53770? +
CVE-2025-53770 affects products from microsoft, specifically: sharepoint_server. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-53770? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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