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CVE-2025-66631 — Vulnerability in Csla — CVE Details

HIGH

Csla affected by Remote Code Execution via WcfProxy (NetDataContractSerializer)

Published December 8, 2025Updated December 9, 2025Source: osv

Summary

### Impact Versions of CSLA .NET prior to version 6 allow the use of WcfProxy. WcfProxy uses the NetDataContractSerializer (NDCS) which has known vulnerabilities that can allow remote execution of code during deserialization. NDCS itself is considered obsolete, and you should avoid using WcfProxy or upgrade to CSLA 6 or higher where this issue does not exist. ### Patches CSLA .NET version 6 and higher do not use WCF or NetDataContractSerializer. ### Workarounds If you are using a version CSLA .NET older than version 6, you should stop using WcfProxy in your data portal configuration. Doing this avoids the use of WCF and the NetDataContractSerializer, avoiding the vulnerability.

Advisory Timeline

  • First published December 8, 2025 (308 days ago).
  • Last revised December 9, 2025 — 1 day after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update Csla to 6.0.0 or later
dotnet add package Csla --version 6.0.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

PackageEcosystemAffectedFixed In
Csla
nuget
5.0.0, 5.0.0-R19052204, 5.0.0-R19080501, 5.0.0-R19082107 (+50 more)6.0.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.3 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2025-66631?
Csla affected by Remote Code Execution via WcfProxy (NetDataContractSerializer) This vulnerability has been assigned a severity rating of HIGH (CVSS score: 9.3/10).
How do I check if my project is affected by CVE-2025-66631?
CVE-2025-66631 affects Csla. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-66631 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.3

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-wq34-7f4g-953v

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