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Fencer Vulns
medium 6.5

CVE-2018-8416 json

Tampering vulnerability in .NET Core

published 2018-11-14 7 y ago modified 2026-06-17 4 mo ago also GHSA-5633-f33j-c6f7 , EUVD-2022-2505

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.3%
EPSS 7.3% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

A tampering vulnerability exists when .NET Core improperly handles specially crafted files, aka ".NET Core Tampering Vulnerability." This affects .NET Core 2.1.

Patch / fix

  • nuget Microsoft.NETCore.App 2.1.7
  • rh-dotnet21-dotnet RHEL 2.1 DOTNET 2.1.500-5.el7
  • rh-dotnet21-dotnet-host RHEL 2.1 DOTNET 2.1.6-5.el7
  • rh-dotnet21-dotnet-sdk-2.1 RHEL 2.1 DOTNET 2.1.500-5.el7
  • rh-dotnet21-dotnet-runtime-2.1 RHEL 2.1 DOTNET 2.1.6-5.el7
  • rh-dotnet21-dotnet-sdk-2.1.5xx RHEL 2.1 DOTNET 2.1.500-5.el7

red hat advisories RHSA-2018:3676

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-2018-8416 updated cvss 5.5

Core: Arbitrary file and directory creation

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet21-dotnet 2.1.500-5.el7, rh-dotnet21-dotnet-host 2.1.6-5.el7, rh-dotnet21-dotnet-sdk-2.1 2.1.500-5.el7, rh-dotnet21-dotnet-runtime-2.1 2.1.6-5.el7, rh-dotnet21-dotnet-sdk-2.1.5xx 2.1.500-5.el7 Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet21-dotnet 2.1.500-5.el7, rh-dotnet21-dotnet-host 2.1.6-5.el7, rh-dotnet21-dotnet-sdk-2.1 2.1.500-5.el7, rh-dotnet21-dotnet-runtime-2.1 2.1.6-5.el7, rh-dotnet21-dotnet-sdk-2.1.5xx 2.1.500-5.el7 Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet21-dotnet 2.1.500-5.el7, rh-dotnet21-dotnet-host 2.1.6-5.el7, rh-dotnet21-dotnet-sdk-2.1 2.1.500-5.el7, rh-dotnet21-dotnet-runtime-2.1 2.1.6-5.el7, rh-dotnet21-dotnet-sdk-2.1.5xx 2.1.500-5.el7
    fixed: vendor fix RHSA-2018:3676
  • 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 Enterprise Linux 8 dotnet, dotnet-host, dotnet-sdk-2.1, dotnet-runtime-2.1, dotnet-sdk-2.1.5xx, dotnet-host-fxr-2.1
    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

7.26% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:P/A:N
GitHub 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NETCore.App
>=2.1.0, <2.1.7
2.1.7

Affected products

  • Microsoft .NET Core

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.