CVE-2025-66631CRITICAL 9.8EPSS p41.9%

CVE-2025-66631CVE-2025-66631

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.56% probability of exploitation · percentile 41.9% · 2026-06-18T12:00:27Z
Published2025-12-09
Last modified2026-03-25

Underlying weaknesses· 1

CWE-502

References

  1. https://github.com/MarimerLLC/csla/issues/4001
  2. https://github.com/MarimerLLC/csla/pull/4018
  3. https://github.com/MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953v

1

TypeTargetConfidenceTier
WeaknessDeserialization of Untrusted Datacwe-5020%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.