Vulnerability-Lookup

RHSA-2021:3142

Vulnerability from csaf_opensuse - Published: 2021-08-11 18:47 - Updated: 2026-10-07 18:26

Summary

Red Hat Security Advisory: .NET Core 3.1 security and bugfix update

Severity

Important

Notes

Topic: An update for .NET Core 3.1 is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: .NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation. New versions of .NET that address security vulnerabilities are now available. The updated versions are .NET SDK 3.1.118 and .NET Runtime 3.1.18. Security Fix(es): * dotnet: ASP.NET Core WebSocket frame processing DoS (CVE-2021-26423) * dotnet: Dump file created world-readable (CVE-2021-34485) * dotnet: ASP.NET Core JWT token logging (CVE-2021-34532) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2021-26423

An infinite loop error was found in ASP.NET when processing WebSocket frames. The exploitation of this issue can cause high CPU resource consumption. The highest threat from this vulnerability is to system availability.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Affected products

Fixed 15 products

Product	Version	Remediation
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:aspnetcore-runtime-3.1-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:aspnetcore-targeting-pack-3.1-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-apphost-pack-3.1-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-apphost-pack-3.1-debuginfo-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-hostfxr-3.1-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-hostfxr-3.1-debuginfo-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-runtime-3.1-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-runtime-3.1-debuginfo-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-sdk-3.1-0:3.1.118-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-sdk-3.1-debuginfo-0:3.1.118-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-targeting-pack-3.1-0:3.1.18-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet-templates-3.1-0:3.1.118-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet3.1-0:3.1.118-1.el8_4.src	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet3.1-debuginfo-0:3.1.118-1.el8_4.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.4.0.Z.MAIN.EUS:dotnet3.1-debugsource-0:3.1.118-1.el8_4.x86_64	—	Vendor Fix fix

Threats

Impact Important

CVE-2021-34485

.NET Core and Visual Studio Information Disclosure Vulnerability

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CWE-732 - Incorrect Permission Assignment for Critical Resource

Affected products

Fixed 15 products, the same list as for CVE-2021-26423

Threats

Impact Low

CVE-2021-34532

ASP.NET Core and Visual Studio Information Disclosure Vulnerability

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CWE-532 - Insertion of Sensitive Information into Log File

Affected products

Fixed 15 products, the same list as for CVE-2021-26423

Threats

Impact Low

References

24 references

URL	Category
https://access.redhat.com/errata/RHSA-2021:3142	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1990286	external
https://bugzilla.redhat.com/show_bug.cgi?id=1990295	external
https://bugzilla.redhat.com/show_bug.cgi?id=1990300	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2021-26423	self
https://bugzilla.redhat.com/show_bug.cgi?id=1990295	external
https://www.cve.org/CVERecord?id=CVE-2021-26423	external
https://nvd.nist.gov/vuln/detail/CVE-2021-26423	external
https://github.com/dotnet/announcements/issues/194	external
https://msrc.microsoft.com/update-guide/vulnerabi…	external
https://access.redhat.com/security/cve/CVE-2021-34485	self
https://bugzilla.redhat.com/show_bug.cgi?id=1990286	external
https://www.cve.org/CVERecord?id=CVE-2021-34485	external
https://nvd.nist.gov/vuln/detail/CVE-2021-34485	external
https://github.com/dotnet/announcements/issues/196	external
https://msrc.microsoft.com/update-guide/vulnerabi…	external
https://access.redhat.com/security/cve/CVE-2021-34532	self
https://bugzilla.redhat.com/show_bug.cgi?id=1990300	external
https://www.cve.org/CVERecord?id=CVE-2021-34532	external
https://nvd.nist.gov/vuln/detail/CVE-2021-34532	external
https://github.com/dotnet/announcements/issues/195	external
https://msrc.microsoft.com/update-guide/vulnerabi…	external

JSON

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CVE-2021-26423 (GCVE-0-2021-26423)

Vulnerability from cvelistv5 – Published: 2021-08-12 18:11 – Updated: 2026-08-10 15:09

Title

.NET Core and Visual Studio Denial of Service Vulnerability

Summary

.NET Core and Visual Studio Denial of Service Vulnerability

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-04 13:28 UTC

CWE

Denial of Service
CWE-noinfo Not enough information

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 3948 records in the last 180 days details

References

2 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://portal.msrc.microsoft.com/en-US/security-…	x_refsource_MISCx_transferred

Impacted products

11 products

Vendor	Product	Version
Microsoft	.NET 5.0	Affected: 5.0.0 , < 5.0.9 (custom)
Microsoft	.NET Core 2.1	Affected: 2.1 , < 2.1.30 (custom)
Microsoft	.NET Core 3.1	Affected: 3.1 , < 3.1.18 (custom)
Microsoft	Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)	Affected: 15.9.0 , < 15.9.38 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9)	Affected: 16.10.0 , < 16.10.5 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)	Affected: 16.0 , < 16.4.25 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)	Affected: 16.0.0 , < 16.7.18 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)	Affected: 15.0.0 , < 16.9.10 (custom)
Microsoft	PowerShell Core 7.0	Affected: 7.0.0 , < 7.0.7 (custom)
Microsoft	PowerShell Core 7.1	Affected: 7.1.0 , < 7.1.4 (custom)
Microsoft	Visual Studio 2019 for Mac version 8.10	Affected: 8.1.0 , < 8.10.7 (custom)

Date Public

2021-08-10 14:00

Show details on NVD website

JSON

To clipboard

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CVE-2021-34485 (GCVE-0-2021-34485)

Vulnerability from cvelistv5 – Published: 2021-08-12 18:11 – Updated: 2026-10-07 16:10

Title

.NET Core and Visual Studio Information Disclosure Vulnerability

Summary

.NET Core and Visual Studio Information Disclosure Vulnerability

Severity

5 (Medium)


                        
                          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

5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-07 16:08 UTC

CWE

Information Disclosure
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 3948 records in the last 180 days details

References

2 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://portal.msrc.microsoft.com/en-US/security-…	x_refsource_MISCx_transferred

Impacted products

10 products

Vendor	Product	Version
Microsoft	.NET 5.0	Affected: 5.0.0 , < 5.0.9 (custom)
Microsoft	.NET Core 2.1	Affected: 2.1 , < 2.1.30 (custom)
Microsoft	.NET Core 3.1	Affected: 3.1 , < 3.1.18 (custom)
Microsoft	Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)	Affected: 15.9.0 , < 15.9.38 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9)	Affected: 16.10.0 , < 16.10.5 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)	Affected: 16.0 , < 16.4.25 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)	Affected: 16.0.0 , < 16.7.18 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)	Affected: 15.0.0 , < 16.9.10 (custom)
Microsoft	PowerShell 7.0	Affected: 7.0.0 , < 7.0.7 (custom)
Microsoft	PowerShell 7.1	Affected: 7.1.0 , < 7.1.4 (custom)

Date Public

2021-08-10 14:00

Show details on NVD website

JSON

To clipboard

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CVE-2021-34532 (GCVE-0-2021-34532)

Vulnerability from cvelistv5 – Published: 2021-08-12 18:12 – Updated: 2026-08-10 15:10

Title

ASP.NET Core and Visual Studio Information Disclosure Vulnerability

Summary

ASP.NET Core and Visual Studio Information Disclosure Vulnerability

Severity

5.5 (Medium)


                        
                          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

CWE

Information Disclosure

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 3948 records in the last 180 days details

References

2 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://portal.msrc.microsoft.com/en-US/security-…	x_refsource_MISCx_transferred

Impacted products

8 products

Vendor	Product	Version
Microsoft	ASP.NET Core 2.1	Affected: 2.0 , < 2.1.29 (custom)
Microsoft	ASP.NET Core 3.1	Affected: 3.0 , < 3.1.18 (custom)
Microsoft	ASP.NET Core 5.0	Affected: 5.0 , < 5.0.9 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9)	Affected: 16.10.0 , < 16.10.5 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)	Affected: 16.0 , < 16.4.25 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)	Affected: 16.0.0 , < 16.7.18 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)	Affected: 15.0.0 , < 16.9.10 (custom)
Microsoft	Visual Studio 2019 for Mac version 8.10	Affected: 8.1.0 , < 8.10.7 (custom)

Date Public

2021-08-10 14:00

Show details on NVD website

JSON

To clipboard

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    "assignerShortName": "microsoft",
    "cveId": "CVE-2021-34532",
    "datePublished": "2021-08-12T18:12:05.000Z",
    "dateReserved": "2021-06-09T00:00:00.000Z",
    "dateUpdated": "2026-08-10T15:10:12.322Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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RHSA-2021:3142

CVE-2021-26423 (GCVE-0-2021-26423)

CVE-2021-34485 (GCVE-0-2021-34485)

CVE-2021-34532 (GCVE-0-2021-34532)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour