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Fencer Vulns
high 7.5

CVE-2018-0786 json

Improper Certificate Validation in Microsoft .NET Framework components

published 2018-01-10 8 y ago modified 2026-06-17 4 mo ago also GHSA-jc8g-xhw5-6x46 , EUVD-2018-0631

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, .NET Core 1.0 and 2.0, and PowerShell Core 6.0.0 allow a security feature bypass vulnerability due to the way certificates are validated, aka ".NET Security Feature Bypass Vulnerability."

Patch / fix

  • nuget Microsoft.NETCore.UniversalWindowsPlatform 5.2.4, 5.3.5, 5.4.2, 6.0.6
  • nuget System.ServiceModel.Primitives 4.1.1, 4.3.1, 4.4.1
  • nuget System.ServiceModel.Http 4.1.1, 4.3.1, 4.4.1
  • nuget System.ServiceModel.NetTcp 4.1.1, 4.3.1, 4.4.1
  • nuget System.ServiceModel.Duplex 4.0.2, 4.3.1, 4.4.1
  • nuget System.ServiceModel.Security 4.0.2, 4.3.1, 4.4.1
  • nuget System.Private.ServiceModel 4.1.1, 4.3.1, 4.4.1

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-2018-0786 updated cvss 7.3

ASP.NET: Incorrect certificate validation can allow attackers to bypass security checks

  • 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
    not affected: vulnerable code not present

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

3.69% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NETCore.UniversalWindowsPlatform
>=5.2.0, <5.2.4
>=5.3.0, <5.3.5
>=5.4.0, <5.4.2
>=6.0.0, <6.0.6
5.2.4
5.3.5
5.4.2
6.0.6
nuget System.ServiceModel.Primitives
>=4.4.0, <4.4.1
>=4.3.0, <4.3.1
>=4.1.0, <4.1.1
4.4.1
4.3.1
4.1.1
nuget System.ServiceModel.Http
>=4.4.0, <4.4.1
>=4.3.0, <4.3.1
>=4.1.0, <4.1.1
4.4.1
4.3.1
4.1.1
nuget System.ServiceModel.NetTcp
>=4.4.0, <4.4.1
>=4.3.0, <4.3.1
>=4.1.0, <4.1.1
4.4.1
4.3.1
4.1.1
nuget System.ServiceModel.Duplex
>=4.4.0, <4.4.1
>=4.3.0, <4.3.1
>=4.0.1, <4.0.2
4.4.1
4.3.1
4.0.2
nuget System.ServiceModel.Security
>=4.4.0, <4.4.1
>=4.3.0, <4.3.1
>=4.0.1, <4.0.2
4.4.1
4.3.1
4.0.2
nuget System.Private.ServiceModel
>=4.4.0, <4.4.1
>=4.3.0, <4.3.1
>=4.1.0, <4.1.1
4.4.1
4.3.1
4.1.1

Affected products

  • Microsoft Corporation .NET Framework, .NET Core, and PowerShell Core

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.