CVE-2018-8356
Improper Certificate Validation in Microsoft .NET Framework components
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2018-8356- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:N/I:P/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2018-8356- Updated
- 2026-11-02
EUVDEUVD-2022-4735 No score
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.
- Record
EUVD-2022-4735- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-p9wx-v264-q34p
Improper Certificate Validation in Microsoft .NET Framework components
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.
- Record
GHSA-p9wx-v264-q34p- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2018-8356- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-p9wx-v264-q34p
Improper Certificate Validation in Microsoft .NET Framework components
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.
- Record
GHSA-p9wx-v264-q34p- CVSS 3.0
- 5.5 Medium
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-295
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
System.Private.ServiceModelNuGet |
4.0.0 up to 4.1.3 | 4.1.3 |
System.Private.ServiceModelNuGet |
4.3.0 up to 4.3.3 | 4.3.3 |
System.Private.ServiceModelNuGet |
4.4.0 up to 4.4.4 | 4.4.4 |
System.Private.ServiceModelNuGet |
4.5.0 up to 4.5.3 | 4.5.3 |
System.ServiceModel.DuplexNuGet |
4.3.0 up to 4.3.3 | 4.3.3 |
System.ServiceModel.DuplexNuGet |
4.4.0 up to 4.4.4 | 4.4.4 |
System.ServiceModel.DuplexNuGet |
4.5.0 up to 4.5.3 | 4.5.3 |
System.ServiceModel.HttpNuGet |
4.3.0 up to 4.3.3 | 4.3.3 |
System.ServiceModel.HttpNuGet |
4.4.0 up to 4.4.4 | 4.4.4 |
System.ServiceModel.HttpNuGet |
4.5.0 up to 4.5.3 | 4.5.3 |
Show 38 moreShow less
| Package | Affected | Fixed |
|---|---|---|
System.ServiceModel.HttpNuGet |
4.0.0 up to 4.1.3 | 4.1.3 |
System.ServiceModel.NetTcpNuGet |
4.3.0 up to 4.3.3 | 4.3.3 |
System.ServiceModel.NetTcpNuGet |
4.4.0 up to 4.4.4 | 4.4.4 |
System.ServiceModel.NetTcpNuGet |
4.5.0 up to 4.5.3 | 4.5.3 |
System.ServiceModel.NetTcpNuGet |
4.0.0 up to 4.1.3 | 4.1.3 |
System.ServiceModel.PrimitivesNuGet |
4.3.0 up to 4.3.3 | 4.3.3 |
System.ServiceModel.PrimitivesNuGet |
4.4.0 up to 4.4.4 | 4.4.4 |
System.ServiceModel.PrimitivesNuGet |
4.5.0 up to 4.5.3 | 4.5.3 |
System.ServiceModel.PrimitivesNuGet |
4.0.0 up to 4.1.3 | 4.1.3 |
System.ServiceModel.SecurityNuGet |
4.3.0 up to 4.3.3 | 4.3.3 |
System.ServiceModel.SecurityNuGet |
4.4.0 up to 4.4.4 | 4.4.4 |
System.ServiceModel.SecurityNuGet |
4.5.0 up to 4.5.3 | 4.5.3 |
System.ServiceModel.DuplexNuGet |
4.0.0 to 4.0.2 | 4.0.4 |
System.ServiceModel.SecurityNuGet |
4.0.0 to 4.0.2 | 4.0.4 |
System.Private.ServiceModelNuGet |
4.0.0 up to 4.1.3, plus listed versions 4.0.1-beta-232254.0.1-beta-234094.1.04.1.0-beta-235164.1.0-rc2-240274.1.14.1.2 |
4.1.3 |
System.Private.ServiceModelNuGet |
4.3.0 up to 4.3.3, plus listed versions 4.3.14.3.2 |
4.3.3 |
System.Private.ServiceModelNuGet |
4.4.0 up to 4.4.4, plus listed versions 4.4.14.4.24.4.3 |
4.4.4 |
System.Private.ServiceModelNuGet |
4.5.0 up to 4.5.3, plus listed versions 4.5.14.5.2 |
4.5.3 |
System.ServiceModel.DuplexNuGet |
4.3.0 up to 4.3.3, plus listed versions 4.3.14.3.2 |
4.3.3 |
System.ServiceModel.DuplexNuGet |
4.4.0 up to 4.4.4, plus listed versions 4.4.14.4.24.4.3 |
4.4.4 |
System.ServiceModel.DuplexNuGet |
4.5.0 up to 4.5.3, plus listed versions 4.5.14.5.2 |
4.5.3 |
System.ServiceModel.DuplexNuGet |
4.0.0 up to 4.0.4, plus listed versions 4.0.14.0.1-beta-232254.0.1-beta-234094.0.1-beta-235164.0.1-rc2-240274.0.24.0.3 |
4.0.4 |
System.ServiceModel.HttpNuGet |
4.3.0 up to 4.3.3, plus listed versions 4.3.14.3.2 |
4.3.3 |
System.ServiceModel.HttpNuGet |
4.4.0 up to 4.4.4, plus listed versions 4.4.14.4.24.4.3 |
4.4.4 |
System.ServiceModel.HttpNuGet |
4.5.0 up to 4.5.3, plus listed versions 4.5.14.5.2 |
4.5.3 |
System.ServiceModel.HttpNuGet |
4.0.0 up to 4.1.3, plus listed versions 4.0.104.0.10-beta-226054.0.10-beta-228164.0.10-beta-230194.0.10-beta-23109 Show 7 moreShow less4.0.11-beta-232254.0.11-beta-234094.0.11-beta-235164.1.04.1.0-rc2-240274.1.14.1.2 |
4.1.3 |
System.ServiceModel.NetTcpNuGet |
4.3.0 up to 4.3.3, plus listed versions 4.3.14.3.2 |
4.3.3 |
System.ServiceModel.NetTcpNuGet |
4.4.0 up to 4.4.4, plus listed versions 4.4.14.4.24.4.3 |
4.4.4 |
System.ServiceModel.NetTcpNuGet |
4.5.0 up to 4.5.3, plus listed versions 4.5.14.5.2 |
4.5.3 |
System.ServiceModel.NetTcpNuGet |
4.0.0 up to 4.1.3, plus listed versions 4.0.1-beta-232254.0.1-beta-234094.1.04.1.0-beta-235164.1.0-rc2-240274.1.14.1.2 |
4.1.3 |
System.ServiceModel.PrimitivesNuGet |
4.3.0 up to 4.3.3, plus listed versions 4.3.14.3.2 |
4.3.3 |
System.ServiceModel.PrimitivesNuGet |
4.4.0 up to 4.4.4, plus listed versions 4.4.14.4.1-servicing-25917-014.4.24.4.3 |
4.4.4 |
System.ServiceModel.PrimitivesNuGet |
4.5.0 up to 4.5.3, plus listed versions 4.5.14.5.2 |
4.5.3 |
System.ServiceModel.PrimitivesNuGet |
4.0.0 up to 4.1.3, plus listed versions 4.0.1-beta-232254.0.1-beta-234094.1.04.1.0-beta-235164.1.0-rc2-240274.1.14.1.2 |
4.1.3 |
System.ServiceModel.SecurityNuGet |
4.3.0 up to 4.3.3, plus listed versions 4.3.14.3.2 |
4.3.3 |
System.ServiceModel.SecurityNuGet |
4.4.0 up to 4.4.4, plus listed versions 4.4.14.4.24.4.3 |
4.4.4 |
System.ServiceModel.SecurityNuGet |
4.5.0 up to 4.5.3, plus listed versions 4.5.14.5.2 |
4.5.3 |
System.ServiceModel.SecurityNuGet |
4.0.0 up to 4.0.4, plus listed versions 4.0.14.0.1-beta-232254.0.1-beta-234094.0.1-beta-235164.0.1-rc2-240274.0.24.0.3 |
4.0.4 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-8356 is a medium vulnerability (CVSS 5.5) in Microsoft .net Core, published July 11, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.75%, the 55th percentile. Fixed in System.Private.ServiceModel 4.1.3.