CVE-2025-66631
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductCslanet Csla .net
PublishedDec 9, 2025
First seenDec 9, 2025
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- cslanet csla_.net6.0.0 or later
- Csla6.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cslanet csla_.net | v < 6.0.0 | 6.0.0 |
| CslaNuGet | v < 6.0.0 | 6.0.0 |
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