CVE-2025-66631

CSLA .NET is vulnerable to Remote Code Execution via WcfProxy

CVSS 7.2 HIGHEPSS 0.6%CWE-502

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.2EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

09 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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: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

Affected products

MarimerLLC · csla

References

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