Vulnerability record · CVE-2025-66631 · published 9 December 2025

CVE-2025-66631: Cslanet csla .net deserialization of untrusted data vulnerability

Cslanet · Csla .Net

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.

7.2 CVSS 4.0 High EPSS 0.67% · top 49.8% CWE-502 · Deserialization of untrusted data

7.2CVSS 4.0 base score

0.67%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

3References

17 Jun 2026Last modified by NVD

Description

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Csla .Net Cslanet

References

Link	Tags
https://github.com/MarimerLLC/csla/issues/4001	Issue Tracking
https://github.com/MarimerLLC/csla/pull/4018	Issue TrackingPatch
https://github.com/MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953v	MitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-66631), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.