🛡️ CVE-2025-66631 — csla

🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-502 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Csla affected by Remote Code Execution via WcfProxy (NetDataContractSerializer)

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2025-66631 is classified as CWE-502: Deserialization of Untrusted Data. Serialised data from an untrusted source is reconstructed into objects, which can trigger code during the process.

Affected software

CVE-2025-66631 is recorded against 2 packages.

  • csla (fixed in 6.0.0)
  • csla-.net (fixed in 6.0.0)

Timeline and source

Published on 8 December 2025 and last revised on 9 December 2025. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
learn.microsoft.com (Web)

Details

Severity HIGH
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-502
Public Exploit ✅ No
Source NVD
Published 2025-12-08
Updated 2026-08-12
Modified 2025-12-09

Affected Packages

Software From version Fixed in
csla — 6.0.0
csla-.net — 6.0.0

Similar Threats

Exploit Protection

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