CVE-2025-53770

Microsoft SharePoint Deserialization of Untrusted Data Vulnerability

n/a

CVSS

99.9%

EPSS (exploit prob.)

100.0%

EPSS percentile

Yes

Actively exploited

Yes

Ransomware use

2025-07-20

Added

MITRE ATT&CK techniques

How this vulnerability maps to adversary behaviour, from the Center for Threat-Informed Defense's public CVE→ATT&CK mappings. Use it to check whether your detections already cover the technique.

Technique	Name	Relationship
T1059	Command and Scripting Interpreter	exploitation technique
T1190	Exploit Public-Facing Application	exploitation technique

Summary

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.

Affected software

Vendor: Microsoft · Product: SharePoint

Weakness types (CWE):

What to do

This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.

Related vulnerabilities in Microsoft

CVE	Name	EPSS	Exploited
CVE-2021-34473	Microsoft Exchange Server Remote Code Execution Vulnerability	100.0%	Yes
CVE-2021-26855	Microsoft Exchange Server Remote Code Execution Vulnerability	100.0%	Yes
CVE-2019-0708	Microsoft Remote Desktop Services Remote Code Execution Vulnerability	100.0%	Yes
CVE-2015-1635	Microsoft HTTP.sys Remote Code Execution Vulnerability	100.0%	Yes
CVE-2021-34523	Microsoft Exchange Server Privilege Escalation Vulnerability	100.0%	Yes
CVE-2022-41082	Microsoft Exchange Server Remote Code Execution Vulnerability	100.0%	Yes
CVE-2012-0158	Microsoft MSCOMCTL.OCX Remote Code Execution Vulnerability	100.0%	Yes
CVE-2020-0688	Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability	100.0%	Yes

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