high7.5
CVE-2021-1723
ASP.NET Core and Visual Studio Denial of Service Vulnerability
Impact
A denial-of-service vulnerability exists in the way Kestrel parses HTTP/2 requests. The security update addresses the vulnerability by fixing the way the Kestrel parses HTTP/2 requests. Users are advised to upgrade.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| nuget | Microsoft.AspNetCore.Server.Kestrel.Core | < 2.1.25 | 2.1.25 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-x64 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.osx-x64 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-arm | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-arm64 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x64 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x86 | >= 3.1.0, < 3.1.11 | 3.1.11 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | = 5.0.1 | 5.0.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Asp.Net Core | from 3.1 through 3.1.10 from 5.0 through 5.0.1 |
| Microsoft | Visual Studio 2019 | from 16.0 through 16.8 |
| Fedoraproject | Fedora | Versions 32, 33 |
References
- NVD record
- CVE.org record
- GitHub advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1723
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1723
- https://github.com/advisories/GHSA-242j-2gm6-5rwx
- https://nvd.nist.gov/vuln/detail/CVE-2021-1723
- https://github.com/dotnet/announcements/issues/170
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3L27CGRVEWUPELNJOGTCW6GLEDBECB4B
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RRXHERXW4KR5WCP76UDW5PC7GX3YQLUW