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 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.
Vulnerability class: Insecure Deserialization
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (50.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Cslanet Csla .Net
- Marimerllc Csla — versions < 6.0.0
Weakness classification (CWE)
References
- github.com/MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953v (Mitigation, Vendor Advisory)
- github.com/MarimerLLC/csla/issues/4001 (Issue Tracking)
- github.com/MarimerLLC/csla/pull/4018 (Patch, Issue Tracking)
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.