CVE-2020-1161

A denial of service vulnerability exists when ASP.NET Core improperly handles web requests, aka 'ASP.NET Core Denial of Service Vulnerability'.

Published: 2020-05-21 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-1161 is rated Moderate Risk (63.8/100): CVSS High severity, with high exploitation likelihood (EPSS 5.70%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.57% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-1161

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 4.13% 5.70% +1.57%
2 2026-01-24 3.72% 4.13% +0.41%
3 2025-11-21 — 3.72% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-1161

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-1161

GitHub Security Advisory for CVE-2020-1161

GHSA-3cf7-7wq6-8842 · Severity: high · Ecosystem: nuget — ASP.NET Core Denial of Service Vulnerability

OS Trackers for CVE-2020-1161

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2020-1161

Affected software / configurations for CVE-2020-1161

Vendor Product Version Raw CPE
microsoft asp.net_core 3.1 cpe:2.3:a:microsoft:asp.net_core:3.1:*:*:*:*:*:*:*
microsoft visual_studio_2017 >= 15.1, <= 15.9 cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*
microsoft visual_studio_2019 >= 16.0, <= 16.5 cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*

References for CVE-2020-1161

cvelogic Threat Intelligence