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Fencer Vulns
medium 5.5

CVE-2021-34532 json

ASP.NET Core and Visual Studio Information Disclosure Vulnerability

published 2021-08-12 5 y ago modified 2026-11-02 6 d ago also BIT-aspnet-core-2021-34532 , EUVD-2021-1835 , GHSA-q7cg-43mg-qp69

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

ASP.NET Core and Visual Studio Information Disclosure Vulnerability

Patch / fix

  • nuget Microsoft.AspNetCore.Authentication.JwtBearer 2.1.29, 3.1.18, 5.0.9
  • bitnami aspnet-core 2.1.3, 3.1.18, 5.0.9
  • Microsoft ASP.NET Core 2.1 2.1.29
  • Microsoft ASP.NET Core 3.1 3.1.18
  • Microsoft ASP.NET Core 5.0 5.0.9
  • Microsoft Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9) 16.10.5
  • Microsoft Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) 16.4.25
  • Microsoft Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) 16.7.18
  • Microsoft Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) 16.9.10
  • Microsoft Visual Studio 2019 for Mac version 8.10 8.10.7
  • 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-2021:3143

  • 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-2021-34532 updated cvss 5.5

dotnet: ASP.NET Core JWT token logging

  • Red Hat .NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) 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, rh-dotnet31-dotnet-host 3.1.18-1.el7_9, rh-dotnet31-dotnet-sdk-3.1 3.1.118-1.el7_9, rh-dotnet50-dotnet-sdk-5.0 5.0.206-1.el7_9, +16 more Red Hat .NET Core on Red Hat Enterprise Linux Server (v. 7) 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, rh-dotnet31-dotnet-host 3.1.18-1.el7_9, rh-dotnet31-dotnet-sdk-3.1 3.1.118-1.el7_9, rh-dotnet50-dotnet-sdk-5.0 5.0.206-1.el7_9, +16 more Red Hat .NET Core on Red Hat Enterprise Linux Workstation (v. 7) 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, rh-dotnet31-dotnet-host 3.1.18-1.el7_9, rh-dotnet31-dotnet-sdk-3.1 3.1.118-1.el7_9, rh-dotnet50-dotnet-sdk-5.0 5.0.206-1.el7_9, +16 more
    fixed: vendor fix RHSA-2021:3143
  • Red Hat Enterprise Linux AppStream (v. 8) 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-3.1 3.1.118-1.el8_4, dotnet-sdk-5.0 5.0.206-1.el8_4, +15 more
    fixed: vendor fix RHSA-2021:3142
  • Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21, rh-dotnet21-runtime 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
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 5.5 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 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
nuget Microsoft.AspNetCore.Authentication.JwtBearer
>=2.1.0, <2.1.29
>=3.0.0, <3.1.18
>=5.0.0, <5.0.9
2.1.29
3.1.18
5.0.9
bitnami aspnet-core
>=2.1.0, <2.1.3
>=3.1.0, <3.1.18
>=5.0.0, <5.0.9
2.1.3
3.1.18
5.0.9

Affected products

  • Microsoft ASP.NET Core 2.1
  • Microsoft ASP.NET Core 3.1
  • Microsoft ASP.NET Core 5.0
  • 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 Visual Studio 2019 for Mac version 8.10

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.