CVE-2025-53770
CRITICAL9.8Insecure deserializationCISA KEVRansomwarePublic PoCTrendingHigh EPSS
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 breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
E
F
RL
W
RC
Changed
Affected products
- Microsoft / Microsoft SharePoint Enterprise Server 201616.0.0 – 16.0.5513.1001
- Microsoft / Microsoft SharePoint Server 201916.0.0 – 16.0.10417.20037
- Microsoft / Microsoft SharePoint Server Subscription Edition16.0.0 – 16.0.18526.20508
Exploits & proofs of concept
- nucleiSharePoint Webshell - ToolShellby johnk3r
- nucleiMicrosoft SharePoint Server - Remote Code Execution (ToolShell)by _l0gg,SamIntruder,sfewer-r7,iamnoooob,pdresearch