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CVE-2025-66631

29
FAUCET Score

CVE-2025-66631 affects CSLA .NET versions 5.5.4 and below, stemming from the use of WcfProxy which leverages the insecure NetDataContractSerializer. This deserialization vulnerability allows for remote code execution. With a CVSS score of 7.2 (HIGH), it presents a significant risk due to its network-based attack vector, low attack complexity, and high potential for confidentiality, integrity, and availability impacts. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 6.0.0CPE matchmatch criteria
cpe:2.3:a:cslanet:csla_.net:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

7.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
UNREPORTED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.57%
Probability of exploitation in next 30 days
EPSS Percentile
44.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0057 is in the 24th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: CslaFixed in: 6.0.0

Vendor Advisories (1)

nugetGHSA-wq34-7f4g-953vhigh

Csla affected by Remote Code Execution via WcfProxy (NetDataContractSerializer)

Dec 8, 2025

References

github.com / MarimerLLC/csla/issues/4001
Issue Tracking
github.com / MarimerLLC/csla/pull/4018
Issue TrackingPatch
github.com / MarimerLLC/csla/security/advisories/GHSA-wq34-7f4g-953v
MitigationVendor Advisory