Deserialization in Cslanet Csla_.net

CVE-2025-66631

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…

Vulnerability class: Insecure Deserialization

EPSS: 0.006 (42.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-66631?
CVE-2025-66631 is a critical-severity vulnerability in Cslanet Csla_.net, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-12-09.
How severe is CVE-2025-66631?
Critical severity. CVSS v3 base score is 9.8 out of 10.