CVE-2025-53770Critical· 9.8▾ Hadal⚠ Exploited in the wild0dayPoC availableDeserialization 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…
▾ Hadal zone — Critical and actively exploited (CISA KEV / 0day)
impact 53.9 · likelihood 20 · exploitation 25 · ransomware 5
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 4 sources. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Federal remediation due Jul 21, 2025
Last analysed / modified upstream
100%
100% → 100%
Exploit-DB · 44 GitHub repos · Metasploit ×1 · Nuclei ×1 (last check)
Added to the CISA catalog on Jul 20, 2025. Federal remediation due Jul 21, 2025. View catalog ↗
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.
sharepoint_server < 16.0.18526.20508sharepoint_server = 2016sharepoint_server = 2019Upgrade past the affected range:
sharepoint_server 16.0.18526.20508Connected by shared product, vendor, weakness, or advisory.
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