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TI-2025-41025 Aliases CVE-2025-66631GHSA-wq34-7f4g-953v

CSLA .NET is vulnerable to Remote Code Execution via WcfProxy

Priority MEDIUM 41CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00674 52nd percentileScored 2026-11-07
Fix Fixed csla (MarimerLLC): 6.0.0Csla (NuGet): 6.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MarimerLLCcslabefore 6.0.06.0.0Patch availableCNA
—Csla (NuGet)before 6.0.06.0.0Patch availableGHSA-wq34-7f4g-953v
  • csla VendorMarimerLLC Affected before 6.0.0 Fixed in 6.0.0 Patch available CNA
  • Csla (NuGet) Vendor— Affected before 6.0.0 Fixed in 6.0.0 Patch available GHSA-wq34-7f4g-953v

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cslanet:csla_.net:*:*:*:*:*:*:*:*before 6.0.0VulnerableCslanet
  • cpe:2.3:a:cslanet:csla_.net:*:*:*:*:*:*:*:* Versions before 6.0.0 Vulnerable ·Cslanet

Remediation

  • Fix · CNA csla (MarimerLLC) Fixed in 6.0.0
  • Fix · GHSA-wq34-7f4g-953v Csla (NuGet) Fixed in 6.0.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-66631
  2. 2026-10-03 Alias added: GHSA-wq34-7f4g-953v

References

Patch 1

Advisory 2

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences