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CVE-2025-66631

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Date: December 9, 2025

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.

Severity Score

Related Resources (7)

https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2310
https://github.com/MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953v
https://github.com/MarimerLLC/csla
https://github.com/MarimerLLC/csla/issues/4001
https://nvd.nist.gov/vuln/detail/CVE-2025-66631
https://github.com/MarimerLLC/csla/pull/4018
https://www.mend.io/vulnerability-database/CVE-2025-66631

Severity Score

Weakness Type (CWE)

Deserialization of Untrusted Data

CWE-502

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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