Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2020-1161
Microsoft ASP.NET Core 3.1 — ASP.NET Core Denial of Service Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N U N N H 7.5 .0514 92.2 —
AFFECTED
Product Versions Fixed
ASP.NET Core 3.1 3.0 – —
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) 15.9.0 – —
Microsoft Visual Studio 2019 version 16.0 16.0 – —
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) 16.0 – —
Microsoft Visual Studio 2019 version 16.5 16.0 – —
TIMELINE
Nov 4 Reserved by microsoft
May 21 Published (CNA: microsoft)
Aug 19 ENRICHED — CVE-2020-1161 (Microsoft ASP.NET Core 3.1). Received CVSS 7.5 and CPE data from NVD.
Description
A denial of service vulnerability exists when ASP.NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against an ASP.NET Core web application. The vulnerability can be exploited remotely, without authentication.
A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the ASP.NET Core application.
The update addresses the vulnerability by correcting how the ASP.NET Core web application handles web requests.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| November 4, 2019 | Reserved | Reserved by microsoft |
| May 21, 2020 | Published | Published (CNA: microsoft) |
| August 19, 2026 | ENRICHED | ENRICHED — CVE-2020-1161 (Microsoft ASP.NET Core 3.1). Received CVSS 7.5 and CPE data from NVD. |
Affected
Affected products and packages — 5 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | ASP.NET Core 3.1 | — | 3.0 | — |
| Microsoft | Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) | — | 15.9.0 | — |
| Microsoft | Microsoft Visual Studio 2019 version 16.0 | — | 16.0 | — |
| Microsoft | Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) | — | 16.0 | — |
| Microsoft | Microsoft Visual Studio 2019 version 16.5 | — | 16.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-1161 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
