No exploitation reportedFix available

CVE-2020-1597

No exploitation reported by the sources we read.

Published2020-08-17

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2020-08-1719:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-1597?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-1597?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

ASP.NET Core

Branch	Affected	Fixed in	Source
2.1	= 2.1	no fix published	NVD
3.1	= 3.1	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
32.x	= 32	no fix published	NVD
33.x	= 33	no fix published	NVD

Microsoft visual studio 2019

Branch	Affected	Fixed in	Source
16.x	≥ 16.0, ≤ 16.3	no fix published	NVD
16.x	≥ 16.5, ≤ 16.6	no fix published	NVD

13 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

portal.msrc.microsoft.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
FIRST EPSSEPSS score6.6 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2020-08-17
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-1597?

Is CVE-2020-1597 actively exploited?

Active exploitation of CVE-2020-1597 has not been confirmed. Its EPSS score was 6.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-1597?

CVE-2020-1597 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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