CVE-2025-66631 json
CSLA .NET is vulnerable to Remote Code Execution via WcfProxy
published 11mo ago modified last mo. also GHSA-wq34-7f4g-953v , EUVD-2025-201825
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 54%
- public exploits
- 0
- none known
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.
Patch / fix
Is CVE-2025-66631 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 11mo ago
Exploit prediction
0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.2 | 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 |
| CNA | 4.0 | 7.2 | 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 |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Csla | <6.0.0 |
6.0.0 |
Affected products
- MarimerLLC csla
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
github.com
/MarimerLLC/csla/pull/4018
web, issue-tracking, patch
-
github.com
/MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953v
web, mitigation, vendor-advisory
-
github.com
/MarimerLLC/csla/issues/4001
web, issue-tracking
-
nvd.nist.gov
/vuln/detail/CVE-2025-66631
advisory
-
github.com
/MarimerLLC/csla
package
-
learn.microsoft.com
/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2310
web
Sources
- CVE List CVE-2025-66631
- GitHub Advisory GHSA-wq34-7f4g-953v
- NVD CVE-2025-66631
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