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CVE-2025-66631— CSLA .NET is vulnerable to Remote Code Execution via WcfProxy

Quick assessment

Affected
MarimerLLC csla
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CSLA .NET是Marimer LLC开源的一个软件开发框架。可帮助用户为应用程序构建可重用、可维护的面向对象的业务层。 CSLA .NET 5.5.4及之前版本存在代码问题漏洞，该漏洞源于反序列化不当，可能导致远程代码执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.66% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-66631

Vulnerability Information
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Vulnerability Title
CSLA .NET is vulnerable to Remote Code Execution via WcfProxy
Source: CVE Program / CVE List V5
Vulnerability Description
CSLA .NET is a framework designed for the development of reusable, object-oriented business layers for applications. Versions 5.5.4 and below allow the use of WcfProxy. WcfProxy uses the now-obsolete NetDataContractSerializer (NDCS) and is vulnerable to remote code execution during deserialization. This vulnerability is fixed in version 6.0.0. To workaround this issue, remove the WcfProxy in data portal configurations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
CSLA .NET 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CSLA .NET是Marimer LLC开源的一个软件开发框架。可帮助用户为应用程序构建可重用、可维护的面向对象的业务层。 CSLA .NET 5.5.4及之前版本存在代码问题漏洞，该漏洞源于反序列化不当，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MarimerLLC csla < 6.0.0 -

II. Public POCs for CVE-2025-66631

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III. Intelligence Information for CVE-2025-66631

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Patches & Fixes for CVE-2025-66631 (1)

Vendor Advisories for CVE-2025-66631 (1)

Other References for CVE-2025-66631 (1)

IV. Related Vulnerabilities

Same weakness: CWE-502

V. Comments for CVE-2025-66631

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