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01 Record

CVE-2023-21538

.NET Denial of Service Vulnerability

HighPUBLISHEDCNA: microsoft
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
View raw JSON

02 Description

.NET Denial of Service Vulnerability

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
2.83% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 86.5% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-01-10 00:00Z3 YR AGO
Last updated
2025-01-01 00:35Z1 YR AGO
Reserved
2022-12-01
Assigning CNA
microsoft
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
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
Weaknesses
  • CWE-502Deserialization of Untrusted DataBase
  • CWE-121Stack-based Buffer OverflowVariant
Data version
5.1
Document digest
90a5dc3de74f25dba358320fdffe9fd5bd3e67e6c4876feb8fcb055a22959524

05 Affected products

VendorProductVersionsPlatforms
Microsoft.NET 6.06.0.0 to < 6.0.13Unknown
MicrosoftPowerShell 7.27.2.0 to < 7.2.9Unknown

06 References

07 Fixed in

AlmaLinux 8

  • aspnetcore-runtime-6.0
    Fixed in 6.0.13-1.el8_7
  • aspnetcore-targeting-pack-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-apphost-pack-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-hostfxr-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-runtime-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-sdk-6.0
    Fixed in 6.0.113-1.el8_7
  • dotnet-sdk-6.0-source-built-artifacts
    Fixed in 6.0.113-1.el8_7
  • dotnet-targeting-pack-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-templates-6.0
    Fixed in 6.0.113-1.el8_7

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • aspnetcore-runtime-6.0
    Fixed in 6.0.13-1.el9_1
  • aspnetcore-targeting-pack-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-apphost-pack-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-hostfxr-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-runtime-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-sdk-6.0
    Fixed in 6.0.113-1.el9_1
  • dotnet-sdk-6.0-source-built-artifacts
    Fixed in 6.0.113-1.el9_1
  • dotnet-targeting-pack-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-templates-6.0
    Fixed in 6.0.113-1.el9_1

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • aspnetcore-runtime-6.0
    Fixed in 6.0.13-1.el8_7
  • aspnetcore-targeting-pack-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-apphost-pack-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-hostfxr-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-runtime-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-sdk-6.0
    Fixed in 6.0.113-1.el8_7
  • dotnet-sdk-6.0-source-built-artifacts
    Fixed in 6.0.113-1.el8_7
  • dotnet-targeting-pack-6.0
    Fixed in 6.0.13-1.el8_7
  • dotnet-templates-6.0
    Fixed in 6.0.113-1.el8_7

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • aspnetcore-runtime-6.0
    Fixed in 6.0.13-1.el9_1
  • aspnetcore-targeting-pack-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-apphost-pack-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-hostfxr-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-runtime-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-sdk-6.0
    Fixed in 6.0.113-1.el9_1
  • dotnet-sdk-6.0-source-built-artifacts
    Fixed in 6.0.113-1.el9_1
  • dotnet-targeting-pack-6.0
    Fixed in 6.0.13-1.el9_1
  • dotnet-templates-6.0
    Fixed in 6.0.113-1.el9_1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • dotnet6
    Fixed in 6.0.113-0ubuntu1~22.04.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.