VulnerabilityModified

CVE-2020-1597

A denial of service vulnerability exists when ASP.NET Core improperly handles web requests.

HIGH 7.5EPSS 6.56%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (6.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 6.56% probability · 94th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Affected: microsoft/asp.net core · microsoft/visual studio 2017 · microsoft/visual studio 2019 · fedoraproject/fedora
Source: secure@microsoft.com

EPSS trend

EPSS 6.6% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.