# 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: 0.0374
- 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

.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 a security vulnerability are now available. The updated versions are .NET SDK 5.0.211 and .NET Runtime 5.0.14.  Security Fix(es):  * dotnet: ASP.NET Core Krestel HTTP headers pooling denial of service (CVE-2022-219862)  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.

## 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 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.