CVE-2023-36038Network attack vector

Unauthenticated service interruption via crafted IIS requests

Published Nov 14, 2023 · Updated Oct 9, 2025

Denial of service in Microsoft ASP.NET Core 8.0 RC2 and earlier allows remote attackers to interrupt IIS-hosted .NET applications. Microsoft identifies ASP.NET IIS request handling as the locus but does not disclose the faulty operation applied to crafted requests. Exploitation requires no authentication, but only applications hosted in IIS are exposed; Kestrel-hosted applications are unaffected.

CVSS severity8.2
High
EPSS probability2.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Microsoft ASP.NET Core 8.0 RC2 and earlier allows remote attackers to interrupt IIS-hosted .NET applications. Microsoft identifies ASP.NET IIS request handling as the locus but does not disclose the faulty operation applied to crafted requests. Exploitation requires no authentication, but only applications hosted in IIS are exposed; Kestrel-hosted applications are unaffected.

The record

CVE
CVE-2023-36038
Published
Nov 14, 2023
Updated
Oct 9, 2025
Vendor
Microsoft
Product
ASP.NET Core 8.0
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.0 <8.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · ASP.NET Core 8.0version=8.0 <8.0.0
Microsoft · Microsoft Visual Studio 2022 version 17.7version=17.7.0 <17.7.7
Microsoft · Microsoft Visual Studio 2022 version 17.6version=17.6.0 <17.6.10
Microsoft · Microsoft Visual Studio 2022 version 17.4version=17.4.0 <17.4.14
Microsoft · .NET 8.0version=8.0 <8.0.0
Microsoft · Microsoft Visual Studio 2022 version 17.2version=17.2.0 <17.2.22

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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