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CVE-2025-66631

Cslanet Csla .net remote code execution

9.8 CRITICALEPSS 0.67%
  1. Published9 Dec 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Cslanet Csla .net< 6.0.0

Remediation

Fixed in
Cslanet Csla .net≥ 6.0.0

References

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Frequently asked

Is CVE-2025-66631 being actively exploited?

CVE-2025-66631 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.67%.

How severe is CVE-2025-66631?

CVE-2025-66631 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.67% probability of exploitation.

Which products are affected by CVE-2025-66631?

Affected products include Cslanet Csla .net.

How do I fix CVE-2025-66631?

Upgrade affected software to a fixed version, for example Cslanet Csla .net 6.0.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.