CVEs / CVE-2020-0603
CVE-2020-0603: Microsoft ASP.NET Core vulnerability
- high 8.8 CVSS 3.1 (NVD)
- EPSS 22.5% chance of exploitation in the next 30 days, higher than 97% of CVEs (5 Nov 2026)
- Last changed at its sources
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Description
A remote code execution vulnerability exists in ASP.NET Core software when the software fails to handle objects in memory.An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user, aka 'ASP.NET Core Remote Code Execution Vulnerability'.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft ASP.NET Core | 2.1 | — |
| Microsoft ASP.NET Core | 3.0 | — |
| Microsoft ASP.NET Core | 3.1 | — |
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft.AspNetCore.All (NuGet) | from 2.1.0, before 2.1.15 | 2.1.15 |
| Microsoft.AspNetCore.App (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App (NuGet) | from 3.0.0, before 3.0.1 | 3.0.1 |
| Microsoft.AspNetCore.App (NuGet) | from 2.1.0, before 2.1.15 | 2.1.15 |
| Microsoft.AspNetCore.Http.Connections (NuGet) | from 1.0.0, before 1.0.15 | 1.0.15 |
| Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.win-arm (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
| Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet) | from 3.1.0, before 3.1.1 | 3.1.1 |
Package versions from GHSA-655q-9gvg-q4cm.
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 4 Nov 2026.
Severity
| CVSS 3.1 | 8.8 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-787 |
References
- CVE-2020-0603 on NVD
- CVE-2020-0603 on OSV
- https://access.redhat.com/errata/RHSA-2020:0130 Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0134 Third Party Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0603 Patch, Vendor Advisory
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.