CVE-2020-1161
HighCVSS 7.5Exploitation Probability (EPSS)
Very high risk92th percentile - higher than 92% of all known CVEs
Summary
Denial of service vulnerability in ASP.NET Core when improperly handling web requests. A remote unauthenticated attacker could send specially crafted requests, causing the application to become unavailable.
Risk Assessment
Risk of disruption to web applications built on ASP.NET Core, which could impact service availability for customers.
Recommendation
Install the security update from the vendor that corrects how web requests are handled.
Other vulnerabilities in ASP.NET Core
See all- CVE-2017-11879High
ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL.
- CVE-2017-0249High
An elevation of privilege vulnerability exists when ASP.NET Core fails to properly sanitize web requests.
- CVE-2026-40372Critical
A vulnerability in ASP.NET Core due to improper verification of cryptographic signature allows an unauthorized attacker to elevate privileges over a network.
- CVE-2026-69304Medium
Improper handling of highly compressed data (data amplification) in ASP.NET Core allows an unauthorized attacker to deny service over a network.
- CVE-2026-57099High
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
- CVE-2026-47303High
ASP.NET Core has an authentication bypass vulnerability due to assumed-immutable data. This allows an authorized attacker to elevate privileges over a network.
- CVE-2026-47300High
Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.
- CVE-2026-56170High
Resource allocation without limits in ASP.NET Core allows an unauthorized attacker to perform a DoS attack over the network.
- CVE-2026-50506High
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service over a network.
- CVE-2026-45646High
A vulnerability in ASP.NET Core allows an unauthorized attacker to perform a Denial of Service (DoS) attack by allocating resources without limits or throttling. The attack can be carried out remotely over a network.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

