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Vulnerability_id VCID-c2rf-abwj-dkau

Summary

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.

Aliases

alias	CVE-2025-53770

Fixed_packages

Affected_packages

References

reference_url

https://api.first.org/data/v1/epss?cve=CVE-2025-53770

reference_id

reference_type

scores

value	0.88182
scoring_system	epss
scoring_elements	0.9951
published_at	2026-06-11T12:55:00Z

value	0.88182
scoring_system	epss
scoring_elements	0.99512
published_at	2026-06-12T12:55:00Z

url

https://api.first.org/data/v1/epss?cve=CVE-2025-53770

reference_url	https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/remote/52405.py
reference_id	CVE-2025-53770
reference_type	exploit
scores
url	https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/windows/remote/52405.py

reference_url

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770

reference_id

CVE-2025-53770

reference_type

scores

value	9.8
scoring_system	cvssv3.1
scoring_elements	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:W/RC:C

value	Act
scoring_system	ssvc
scoring_elements	SSVCv2/E:A/A:Y/T:T/P:M/B:A/M:M/D:C/2025-07-23T03:55:22Z/

url

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770

Weaknesses

cwe_id	502
name	Deserialization of Untrusted Data
description	The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

Exploits

date_added	`null`
description	This module exploits the authentication bypass vulnerabilities CVE-2025-49706 and CVE-2025-53771, and an unsafe deserialization vulnerability CVE-2025-49704, to achieve unauthenticated RCE against a vulnerable Microsoft SharePoint Server. The vulnerability CVE-2025-53770 was disclosed as being a patch bypass of CVE-2025-49704, and as described by the finders, CVE-2025-53770 targets a different endpoint within the /_vti_bin/ URI path. As this exploit module does not target the endpoint associated with CVE-2025-53770 (per the original finders), we believe this module is best described as exploiting CVE-2025-49704 and not CVE-2025-53770.
required_action	`null`
due_date	`null`
notes	Stability: - crash-safe Reliability: - repeatable-session SideEffects: - ioc-in-logs
known_ransomware_campaign_use	`false`
source_date_published	2025-07-08
exploit_type	`null`
platform	Windows
source_date_updated	`null`
data_source	Metasploit
source_url	https://github.com/rapid7/metasploit-framework/tree/master/modules/exploits/windows/http/sharepoint_toolpane_rce.rb

date_added	2025-07-20
description	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.
required_action	Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
due_date	2025-07-21
notes	CISA Mitigation Instructions: https://www.cisa.gov/news-events/alerts/2025/07/20/microsoft-releases-guidance-exploitation-sharepoint-vulnerability-cve-2025-53770; https://www.microsoft.com/en-us/security/blog/2025/07/22/disrupting-active-exploitation-of-on-premises-sharepoint-vulnerabilities/ ; https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53770 ; https://nvd.nist.gov/vuln/detail/CVE-2025-53770
known_ransomware_campaign_use	`true`
source_date_published	`null`
exploit_type	`null`
platform	`null`
source_date_updated	`null`
data_source	KEV
source_url	`null`

date_added	2025-08-11
description	Microsoft SharePoint Server 2019 (16.0.10383.20020) - Remote Code Execution (RCE)
required_action	`null`
due_date	`null`
notes	`null`
known_ransomware_campaign_use	`false`
source_date_published	2025-08-11
exploit_type	remote
platform	windows
source_date_updated	2025-08-11
data_source	Exploit-DB
source_url

Severity_range_score 9.8 - 9.8

Exploitability null

Weighted_severity null

Risk_score null

Resource_url http://public2.vulnerablecode.io/vulnerabilities/VCID-c2rf-abwj-dkau

Vulnerability Instance