PT-2025-30160 · Microsoft · Sharepoint Server

Published 2025-07-19 · Updated 2026-05-01 · CVE-2025-53770

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Microsoft SharePoint Enterprise Server 2016 Microsoft SharePoint Server (affected versions not specified)

Description Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. The issue occurs due to a flaw in the deserialization mechanism, enabling an unauthenticated attacker with network access to upload a serialized .NET object for subsequent execution. This flaw has been exploited in the wild, with reports indicating approximately 400 organizations were affected by zero-day attacks linked to Chinese actors.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

LPE

RCE

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

BDU:2025-08714

CVE-2025-53770

ZDI-25-653

Affected Products

Sharepoint Server

References · 1238

• 🔥 https://github.com/soltanali0/CVE-2025-53770-Exploit · Exploit
• 🔥 https://github.com/kaizensecurity/CVE-2025-53770 · Exploit
• 🔥 https://research.eye.security/sharepoint-under-siege · Exploit
• 🔥 https://arstechnica.com/security/2025/07/sharepoint-vulnerability-with-9-8-severity-rating-is-under-exploit-across-the-globe · Exploit
• 🔥 https://exploit-db.com/exploits/52405 · Exploit
• https://msrc.microsoft.com/blog/2025/07/customer-guidance-for-sharepoint-vulnerability-cve-2025-53770 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-53770 · Security Note
• https://osv.dev/vulnerability/CVE-2025-53770 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-08714 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-25-653 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/723277 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-53770 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 · Vendor Advisory
• https://github.com/n1chr0x/Zeropoint · Note
• https://twitter.com/SmCoAnTkT3E_R/status/1947101432441614672 · Twitter Post