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Fencer Vulns
medium 5.5

CVE-2018-8356 json

Improper Certificate Validation in Microsoft .NET Framework components

published 2018-07-11 8 y ago modified 2026-06-17 4 mo ago also GHSA-p9wx-v264-q34p , EUVD-2022-4735

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

A security feature bypass vulnerability exists when Microsoft .NET Framework components do not correctly validate certificates, aka ".NET Framework Security Feature Bypass Vulnerability." This affects .NET Framework 4.7.2, Microsoft .NET Framework 3.0, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, ASP.NET Core 1.1, Microsoft .NET Framework 4.5.2, ASP.NET Core 2.0, ASP.NET Core 1.0, .NET Core 1.1, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.6/4.6.1/4.6.2, .NET Core 1.0, .NET Core 2.0, Microsoft .NET Framework 4.6, Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.1/4.7.2, Microsoft .NET Framework 4.7.2.

Patch / fix

  • nuget System.Private.ServiceModel 4.1.3, 4.3.3, 4.4.4, 4.5.3
  • nuget System.ServiceModel.Duplex 4.0.4, 4.3.3, 4.4.4, 4.5.3
  • nuget System.ServiceModel.Http 4.1.3, 4.3.3, 4.4.4, 4.5.3
  • nuget System.ServiceModel.NetTcp 4.1.3, 4.3.3, 4.4.4, 4.5.3
  • nuget System.ServiceModel.Primitives 4.1.3, 4.3.3, 4.4.4, 4.5.3
  • nuget System.ServiceModel.Security 4.0.4, 4.3.3, 4.4.4, 4.5.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-8356 updated cvss 6.5

Core: incorrect certificates validation

  • Red Hat .NET Core 1.0 on Red Hat Enterprise Linux rh-dotnetcore10-dotnetcore Red Hat .NET Core 1.1 on Red Hat Enterprise Linux rh-dotnetcore11-dotnetcore Red Hat .NET Core 2.0 on Red Hat Enterprise Linux rh-dotnet20-dotnet Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21-dotnet, rh-dotnet21-dotnet-host, rh-dotnet21-dotnet-sdk-2.1, rh-dotnet21-dotnet-runtime-2.1, rh-dotnet21-dotnet-sdk-2.1.3xx, rh-dotnet21-dotnet-sdk-2.1.4xx, +1 more
    affected: no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
nuget System.Private.ServiceModel
>=4.0.0, <4.1.3
>=4.3.0, <4.3.3
>=4.4.0, <4.4.4
>=4.5.0, <4.5.3
4.1.3
4.3.3
4.4.4
4.5.3
nuget System.ServiceModel.Duplex
>=4.3.0, <4.3.3
>=4.4.0, <4.4.4
>=4.5.0, <4.5.3
>=4.0.0, <4.0.4
4.3.3
4.4.4
4.5.3
4.0.4
nuget System.ServiceModel.Http
>=4.3.0, <4.3.3
>=4.4.0, <4.4.4
>=4.5.0, <4.5.3
>=4.0.0, <4.1.3
4.3.3
4.4.4
4.5.3
4.1.3
nuget System.ServiceModel.NetTcp
>=4.3.0, <4.3.3
>=4.4.0, <4.4.4
>=4.5.0, <4.5.3
>=4.0.0, <4.1.3
4.3.3
4.4.4
4.5.3
4.1.3
nuget System.ServiceModel.Primitives
>=4.3.0, <4.3.3
>=4.4.0, <4.4.4
>=4.5.0, <4.5.3
>=4.0.0, <4.1.3
4.3.3
4.4.4
4.5.3
4.1.3
nuget System.ServiceModel.Security
>=4.3.0, <4.3.3
>=4.4.0, <4.4.4
>=4.5.0, <4.5.3
>=4.0.0, <4.0.4
4.3.3
4.4.4
4.5.3
4.0.4

Affected products

  • Microsoft Microsoft .NET Framework
  • Microsoft .NET Core
  • Microsoft ASP.NET Core
  • Microsoft .NET Framework

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.