CVE-2023-36899Network attack vector

Privilege escalation via inherited IIS application pool

Published Aug 8, 2023 · Updated Aug 10, 2026

Improper input validation in ASP.NET on affected .NET Framework releases allows remote authenticated users to elevate privileges through IIS. ASP.NET does not correctly validate the application-pool relationship when an IIS application runs in its parent application's Application Pool. Low-privileged access and that shared-pool arrangement are required; exploitation breaks the intended privilege boundary or enables a security bypass.

CVSS severity8.8
High
EPSS probability76.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in ASP.NET on affected .NET Framework releases allows remote authenticated users to elevate privileges through IIS. ASP.NET does not correctly validate the application-pool relationship when an IIS application runs in its parent application's Application Pool. Low-privileged access and that shared-pool arrangement are required; exploitation breaks the intended privilege boundary or enables a security bypass.

The record

CVE
CVE-2023-36899
Published
Aug 8, 2023
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Microsoft .NET Framework 3.5 and 4.8.1
Classifications
CWE-20, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.8.1 <4.8.09176.01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft .NET Framework 3.5 and 4.8.1version=4.8.1 <4.8.09176.01
Microsoft · Microsoft .NET Framework 3.5 and 4.6.2version=4.7.0 <10.0.10240.20107
Microsoft · Microsoft .NET Framework 3.5 and 4.8version=4.8.0 <4.8.04654.06
Microsoft · Microsoft .NET Framework 2.0 Service Pack 2version=2.0.0 <2.0.50727.8974
Microsoft · Microsoft .NET Framework 3.5 and 4.7.2version=4.7.0 <4.7.4057.05
Microsoft · Microsoft .NET Frameworkversion=3.0.0.0 <10.0.14393.6167; version=4.7.0 <4.7.04057.05
Microsoft · Microsoft .NET Framework 4.6.2version=4.7.0 <4.7.04057.05
Microsoft · Microsoft .NET Framework 4.8version=4.8.0 <4.8.4654.06

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

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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