CVE-2025-66631

Name: CVE-2025-66631
Creator: NVD / NIST
Published: 2025-12-09T16:18:22.103+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2025-66631 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

7.2/10

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.56%

42.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Cslanet	Csla .Net	< 6.0.0

References

https://github.com/MarimerLLC/csla/issues/4001Issue Tracking
https://github.com/MarimerLLC/csla/pull/4018Issue Tracking, Patch
https://github.com/MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953vMitigation, Vendor Advisory

Timeline

Published: Dec 9, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66631?

How severe is CVE-2025-66631?

CVE-2025-66631 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66631?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66631?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST