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Fencer Vulns
medium 5.5

CVE-2021-34485 json

.NET Core and Visual Studio Information Disclosure Vulnerability

published 2021-08-12 5 y ago modified 2026-10-08 32 d ago also BIT-dotnet-2021-34485 , BIT-dotnet-sdk-2021-34485 , EUVD-2022-7165 , GHSA-vgwq-hfqc-58wv

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

.NET Core and Visual Studio Information Disclosure Vulnerability

Patch / fix

  • nuget Microsoft.NETCore.App 2.1.29
  • nuget Microsoft.NETCore.App.Runtime.linux-arm 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.linux-arm64 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-x64 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.linux-x64 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.osx-x64 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.rhel.6-x64 3.1.18
  • nuget Microsoft.NETCore.App.Runtime.win-arm 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.win-arm64 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.win-x64 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.win-x86 3.1.18, 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.linux-musl-arm 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.linux-arm 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.linux-arm64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.linux-x64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64 5.0.9
  • nuget Microsoft.NETCore.App.Runtime.Mono.osx-x64 5.0.9
  • bitnami dotnet 5.0.9
  • bitnami dotnet-sdk 5.0.9
  • Microsoft .NET 5.0 5.0.9
  • Microsoft .NET Core 2.1 2.1.30
  • Microsoft .NET Core 3.1 3.1.18
  • Microsoft Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) 15.9.38
  • dotnet RHEL 8 5.0.206-1.el8_4
  • dotnet5.0 RHEL 8 5.0.206-1.el8_4
  • dotnet-host RHEL 8 5.0.9-1.el8_4
  • dotnet-sdk-5.0 RHEL 8 5.0.206-1.el8_4
  • dotnet-hostfxr-5.0 RHEL 8 5.0.9-1.el8_4
  • dotnet-runtime-5.0 RHEL 8 5.0.9-1.el8_4
  • dotnet-templates-5.0 RHEL 8 5.0.206-1.el8_4
  • aspnetcore-runtime-5.0 RHEL 8 5.0.9-1.el8_4

red hat advisories RHSA-2021:3148RHSA-2021:3147RHSA-2021:3142RHSA-2021:3143RHSA-2021:3145RHSA-2021:3144

  • dotnet-sdk Arch Linux 6.0.0.sdk100-1
  • dotnet-runtime Arch Linux 6.0.0.sdk100-1

arch linux advisories AVG-2277

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-2021-34485 updated cvss 5.5

dotnet: Dump file created world-readable

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) rh-dotnet21 2.1-28.el7_9, rh-dotnet21-runtime 2.1-28.el7_9, rh-dotnet21-dotnet 2.1.525-1.el7_9, rh-dotnet31-dotnet 3.1.118-1.el7_9, rh-dotnet50-dotnet 5.0.206-1.el7_9, rh-dotnet50-dotnet-host 5.0.9-1.el7_9, +23 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) rh-dotnet21 2.1-28.el7_9, rh-dotnet21-runtime 2.1-28.el7_9, rh-dotnet21-dotnet 2.1.525-1.el7_9, rh-dotnet31-dotnet 3.1.118-1.el7_9, rh-dotnet50-dotnet 5.0.206-1.el7_9, rh-dotnet50-dotnet-host 5.0.9-1.el7_9, +23 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) rh-dotnet21 2.1-28.el7_9, rh-dotnet21-runtime 2.1-28.el7_9, rh-dotnet21-dotnet 2.1.525-1.el7_9, rh-dotnet31-dotnet 3.1.118-1.el7_9, rh-dotnet50-dotnet 5.0.206-1.el7_9, rh-dotnet50-dotnet-host 5.0.9-1.el7_9, +23 more
    fixed: vendor fix RHSA-2021:3144
  • Red Hat Enterprise Linux AppStream (v. 8) dotnet 2.1.525-1.el8_4, dotnet 5.0.206-1.el8_4, dotnet-host 5.0.9-1.el8_4, dotnet3.1 3.1.118-1.el8_4, dotnet5.0 5.0.206-1.el8_4, dotnet-sdk-2.1 2.1.525-1.el8_4, +20 more
    fixed: vendor fix RHSA-2021:3142

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
33 d ago

Exploit prediction

2.07% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
CISA ADP 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
GitHub 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N
OSV 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.NETCore.App
>=2.1.0, <2.1.29
2.1.29
nuget Microsoft.NETCore.App.Runtime.linux-arm
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.linux-arm64
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm64
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.linux-musl-x64
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.linux-x64
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.osx-x64
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.rhel.6-x64
>=3.1.0, <3.1.18
3.1.18
nuget Microsoft.NETCore.App.Runtime.win-arm
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.win-arm64
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.win-x64
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.win-x86
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
3.1.18
5.0.9
nuget Microsoft.NETCore.App.Runtime.linux-musl-arm
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.linux-arm
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.linux-arm64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.linux-x64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64
>=5.0.0, <5.0.9
5.0.9
nuget Microsoft.NETCore.App.Runtime.Mono.osx-x64
>=5.0.0, <5.0.9
5.0.9
bitnami dotnet
>=5.0.0, <5.0.9
5.0.9
bitnami dotnet-sdk
>=5.0.0, <5.0.9
5.0.9

Affected products

  • Microsoft .NET 5.0
  • Microsoft .NET Core 2.1
  • Microsoft .NET Core 3.1
  • Microsoft Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
  • Microsoft Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9)
  • Microsoft Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)
  • Microsoft Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)
  • Microsoft Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)
  • Microsoft PowerShell 7.0
  • Microsoft PowerShell 7.1

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

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.