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-2026-88092Critical
Inconsistent interpretation of HTTP requests (HTTP request/response smuggling) in ASP.NET Core allows an unauthorized attacker to perform tampering over a network.
- CVE-2026-70188Critical
Inconsistent interpretation of HTTP requests (HTTP request/response smuggling) in ASP.NET Core allows an unauthorized attacker to bypass a security feature over a network.
- 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-2025-55315Critical
Inconsistent interpretation of HTTP requests ('HTTP request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.
- CVE-2021-31957Medium
ASP.NET Core has a Denial of Service (DoS) vulnerability that could lead to service overload and unavailability.
- CVE-2026-114148High
ASP.NET Core has incorrect default permissions that allow an authorized attacker to elevate privileges locally. The issue concerns the default permission configuration in the ASP.NET Core environment.
- CVE-2026-109468High
A vulnerability in ASP.NET Core involves allocation of resources without limits or throttling. An unauthenticated attacker can cause a denial of service over a network.
- CVE-2026-96236High
Allocation of resources without limits or throttling in ASP.NET Core allows an unauthorized attacker to deny service 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

