BaseFortify

Publication date: 2025-12-09

Last updated on: 2026-03-25

Assigner: GitHub, Inc.

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.

CVSS Scores

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Meta Information

Published

2025-12-09

Last Modified

2026-03-25

Generated

2026-07-06

AI Q&A

2025-12-09

EPSS Evaluated

2026-07-05

NVD

CVE-2025-66631

Affected Vendors & Products

Vendor	Product	Version / Range
cslanet	csla_.net	to 6.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-502	The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

Executive Summary

This vulnerability exists in CSLA .NET versions 5.5.4 and below, specifically in the WcfProxy component which uses the obsolete NetDataContractSerializer (NDCS). The issue allows remote code execution during the deserialization process, meaning an attacker could execute arbitrary code remotely by exploiting how data is deserialized. The vulnerability is fixed in version 6.0.0, and a workaround is to remove WcfProxy from data portal configurations.

Impact Analysis

This vulnerability can lead to remote code execution on systems using vulnerable versions of CSLA .NET with WcfProxy enabled. An attacker could exploit this to run arbitrary code remotely, potentially compromising the affected system, leading to data breaches, system control loss, or further attacks within the network.

Mitigation Strategies

To mitigate this vulnerability, remove the WcfProxy in data portal configurations or upgrade CSLA .NET to version 6.0.0 or later where the issue is fixed.

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