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TI-2017-08723 Aliases CVE-2017-11770GHSA-7mfr-774f-w5r9

Improper certificate validation in Microsoft .NET Core

Priority MEDIUM 41CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-295.

Summary

.NET Core 1.0, 1.1, and 2.0 allow an unauthenticated attacker to remotely cause a denial of service attack against a .NET Core web application by improperly parsing certificate data. A denial of service vulnerability exists when .NET Core improperly handles parsing certificate data, aka ".NET CORE Denial Of Service Vulnerability".

Why it matters now

EPSS 0.05423 92nd percentileScored 2026-11-07
Fix Fixed System.Security.Cryptography.X509Certificates (NuGet): 4.1.2Microsoft.NETCore.App (NuGet): 2.0.3Red Hat: 1 advisory

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Microsoft.NET Core.NET Core 1.0, .NET Core 1.1, and .NET Core 2.0—No fix listedCNA
—System.Security.Cryptography.X509Certificates (NuGet)4.0.0 to before 4.1.24.1.2Patch availableGHSA-7mfr-774f-w5r9
—Microsoft.NETCore.App (NuGet)1.0.0 to before 2.0.32.0.3Patch availableGHSA-7mfr-774f-w5r9
  • .NET Core VendorMicrosoft Affected .NET Core 1.0, .NET Core 1.1, and .NET Core 2.0 Fixed in — No fix listed CNA
  • System.Security.Cryptography.X509Certificates (NuGet) Vendor— Affected 4.0.0 to before 4.1.2 Fixed in 4.1.2 Patch available GHSA-7mfr-774f-w5r9
  • Microsoft.NETCore.App (NuGet) Vendor— Affected 1.0.0 to before 2.0.3 Fixed in 2.0.3 Patch available GHSA-7mfr-774f-w5r9

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:aspnetcore:1.0:*:*:*:*:*:*:*1.0VulnerableMicrosoft
cpe:2.3:a:microsoft:aspnetcore:1.1:*:*:*:*:*:*:*1.1VulnerableMicrosoft
cpe:2.3:a:microsoft:aspnetcore:2.0:*:*:*:*:*:*:*2.0VulnerableMicrosoft
  • cpe:2.3:a:microsoft:aspnetcore:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:aspnetcore:1.1:*:*:*:*:*:*:* Versions 1.1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:aspnetcore:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Microsoft

Remediation

  • Fix · GHSA-7mfr-774f-w5r9 System.Security.Cryptography.X509Certificates (NuGet) Fixed in 4.1.2 Advisory →
  • Fix · GHSA-7mfr-774f-w5r9 Microsoft.NETCore.App (NuGet) Fixed in 2.0.3 Advisory →

Red Hat 1 advisory

  • RHSA-2017:3248 Released 2017-11-20 · Red Hat rating Low
    .NET Core security update
    • .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet20-dotnet-2.0.3-4.el7, rh-dotnet20-dotnet-host-2.0.3-4.el7, rh-dotnet20-dotnet-runtime-2.0-2.0.3-4.el7 +3
    • .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet20-dotnet-2.0.3-4.el7, rh-dotnet20-dotnet-host-2.0.3-4.el7, rh-dotnet20-dotnet-runtime-2.0-2.0.3-4.el7 +3
    • .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet20-dotnet-2.0.3-4.el7, rh-dotnet20-dotnet-host-2.0.3-4.el7, rh-dotnet20-dotnet-runtime-2.0-2.0.3-4.el7 +3

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2017:3248
.NET Core on Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2017:3248
.NET Core on Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2017:3248

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-11770
  2. 2026-10-03 Alias added: GHSA-7mfr-774f-w5r9

References

Patch 1

Advisory 2

  • TI-2017-08821 .NET Core 1.0, 1.1, and 2.0 allow an unauthenticated attacker to remotely cause a denial… CVSS 3.0HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences