# CVE-2022-21986: .NET Denial of Service Vulnerability

CVE-2022-21986 is fixed in 22 products on 1 platform, first by RHSA-2022:0495, released February 9, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-21986
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0360
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Feb 8, 2022
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21986

## Description

dotnet: ASP.NET Core Krestel HTTP headers pooling denial of service (CVE-2022-219862)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | aspnetcore-runtime-5.0 RHEL 8 | 0:5.0.14-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | aspnetcore-runtime-5.0 ol 8 | 0:5.0.14-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | aspnetcore-runtime-6.0 RHEL 8 | 0:6.0.2-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | aspnetcore-runtime-6.0 almalinux 8 | 6.0.2-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | aspnetcore-runtime-6.0 ol 8 | 0:6.0.2-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | aspnetcore-targeting-pack-5.0 RHEL 8 | 0:5.0.14-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | aspnetcore-targeting-pack-5.0 ol 8 | 0:5.0.14-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | aspnetcore-targeting-pack-6.0 RHEL 8 | 0:6.0.2-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | aspnetcore-targeting-pack-6.0 almalinux 8 | 6.0.2-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | aspnetcore-targeting-pack-6.0 ol 8 | 0:6.0.2-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet RHEL 8 | 0:6.0.102-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet almalinux 8 | 6.0.102-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet ol 8 | 0:6.0.102-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet-apphost-pack-5.0 RHEL 8 | 0:5.0.14-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-apphost-pack-5.0 ol 8 | 0:5.0.14-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-apphost-pack-6.0 RHEL 8 | 0:6.0.2-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-apphost-pack-6.0 almalinux 8 | 6.0.2-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-apphost-pack-6.0 ol 8 | 0:6.0.2-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet-host RHEL 8 | 0:6.0.2-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-host almalinux 8 | 6.0.2-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-host ol 8 | 0:6.0.2-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet-hostfxr-5.0 RHEL 8 | 0:5.0.14-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-hostfxr-5.0 ol 8 | 0:5.0.14-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-hostfxr-6.0 RHEL 8 | 0:6.0.2-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-hostfxr-6.0 almalinux 8 | 6.0.2-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-hostfxr-6.0 ol 8 | 0:6.0.2-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet-runtime-5.0 RHEL 8 | 0:5.0.14-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-runtime-5.0 ol 8 | 0:5.0.14-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-runtime-6.0 RHEL 8 | 0:6.0.2-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-runtime-6.0 almalinux 8 | 6.0.2-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-runtime-6.0 ol 8 | 0:6.0.2-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet-sdk-5.0 RHEL 8 | 0:5.0.211-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-sdk-5.0 ol 8 | 0:5.0.211-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-sdk-5.0-source-built-artifacts RHEL 8 | 0:5.0.211-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-sdk-5.0-source-built-artifacts ol 8 | 0:5.0.211-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-sdk-6.0 RHEL 8 | 0:6.0.102-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-sdk-6.0 almalinux 8 | 6.0.102-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-sdk-6.0 ol 8 | 0:6.0.102-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet-targeting-pack-5.0 RHEL 8 | 0:5.0.14-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-targeting-pack-5.0 ol 8 | 0:5.0.14-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-targeting-pack-6.0 RHEL 8 | 0:6.0.2-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-targeting-pack-6.0 almalinux 8 | 6.0.2-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-targeting-pack-6.0 ol 8 | 0:6.0.2-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet-templates-5.0 RHEL 8 | 0:5.0.211-1.el8_5 | [RHSA-2022:0495](https://patchblox.com/security/data/fix/linux/rhsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-templates-5.0 ol 8 | 0:5.0.211-1.0.1.el8_5 | [ELSA-2022-0495](https://patchblox.com/security/data/fix/linux/elsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet-templates-6.0 RHEL 8 | 0:6.0.102-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-templates-6.0 almalinux 8 | 6.0.102-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | dotnet-templates-6.0 ol 8 | 0:6.0.102-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |
| Linux | dotnet5.0 rocky 8 | 0:5.0.211-1.el8_5 | [RLSA-2022:0495](https://patchblox.com/security/data/fix/linux/rlsa-2022-0495.md) | Feb 9, 2022 |
| Linux | dotnet6.0 rocky 8 | 0:6.0.102-1.el8_5 | [RLSA-2022:0496](https://patchblox.com/security/data/fix/linux/rlsa-2022-0496.md) | Feb 9, 2022 |
| Linux | netstandard-targeting-pack-2.1 RHEL 8 | 0:6.0.102-1.el8_5 | [RHSA-2022:0496](https://patchblox.com/security/data/fix/linux/rhsa-2022-0496.md) | Feb 9, 2022 |
| Linux | netstandard-targeting-pack-2.1 almalinux 8 | 6.0.102-1.el8_5 | [ALSA-2022:0496](https://patchblox.com/security/data/fix/linux/alsa-2022-0496.md) | Feb 9, 2022 |
| Linux | netstandard-targeting-pack-2.1 ol 8 | 0:6.0.102-1.0.1.el8_5 | [ELSA-2022-0496](https://patchblox.com/security/data/fix/linux/elsa-2022-0496.md) | Mar 9, 2022 |

---

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