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Fencer Intel
high 7.5

CVE-2017-11770 json

Improper Certificate Validation

published 2017-11-15 8 y ago modified 2026-06-17 4 mo ago also GHSA-7mfr-774f-w5r9 , EUVD-2022-1668

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.4%
EPSS 5.4% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

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".

Patch / fix

  • nuget System.Security.Cryptography.X509Certificates 4.1.2
  • nuget Microsoft.NETCore.App 2.0.3
  • rh-dotnet20-dotnet RHEL 2.0 DOTNET 2.0.3-4.el7
  • rh-dotnet20-dotnet-host RHEL 2.0 DOTNET 2.0.3-4.el7
  • rh-dotnet20-dotnet-sdk-2.0 RHEL 2.0 DOTNET 2.0.3-4.el7
  • rh-dotnetcore10-dotnetcore RHEL 1.0 DOTNET 1.0.8-1.el7
  • rh-dotnetcore11-dotnetcore RHEL 1.1 DOTNET 1.1.5-1.el7
  • rh-dotnet20-dotnet-runtime-2.0 RHEL 2.0 DOTNET 2.0.3-4.el7

red hat advisories RHSA-2017:3248

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-2017-11770 updated cvss 5.9

Core: DoS via bad certificate

  • Red Hat .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-sdk-2.0 2.0.3-4.el7, rh-dotnetcore10-dotnetcore 1.0.8-1.el7, rh-dotnetcore11-dotnetcore 1.1.5-1.el7, rh-dotnet20-dotnet-runtime-2.0 2.0.3-4.el7 Red Hat .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-sdk-2.0 2.0.3-4.el7, rh-dotnetcore10-dotnetcore 1.0.8-1.el7, rh-dotnetcore11-dotnetcore 1.1.5-1.el7, rh-dotnet20-dotnet-runtime-2.0 2.0.3-4.el7 Red Hat .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-sdk-2.0 2.0.3-4.el7, rh-dotnetcore10-dotnetcore 1.0.8-1.el7, rh-dotnetcore11-dotnetcore 1.1.5-1.el7, rh-dotnet20-dotnet-runtime-2.0 2.0.3-4.el7
    fixed: vendor fix RHSA-2017:3248

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

5.42% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Affected packages

ecosystem package affected fixed in
nuget System.Security.Cryptography.X509Certificates
>=4.0.0, <4.1.2
4.1.2
nuget Microsoft.NETCore.App
>=1.0.0, <2.0.3
2.0.3

Affected products

  • Microsoft Corporation .NET Core

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Intel 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.