CVE-2023-36799Network attack vector

Service interruption via crafted X.509 certificate

Published Sep 12, 2023 · Updated Oct 30, 2025

Denial of service in Microsoft .NET 6.0 and 7.0 allows remote attackers to interrupt Linux applications via a crafted X.509 certificate. Microsoft has not published the parser locus or resource operation triggered while the runtime reads the malformed certificate. Exploitation requires user interaction that causes a Linux application to process attacker-supplied certificate data; the exact interruption mode is undisclosed.

CVSS severity6.5
Medium
EPSS probability4.91%
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 .NET 6.0 and 7.0 allows remote attackers to interrupt Linux applications via a crafted X.509 certificate. Microsoft has not published the parser locus or resource operation triggered while the runtime reads the malformed certificate. Exploitation requires user interaction that causes a Linux application to process attacker-supplied certificate data; the exact interruption mode is undisclosed.

The record

CVE
CVE-2023-36799
Published
Sep 12, 2023
Updated
Oct 30, 2025
Vendor
Microsoft
Product
.NET 6.0
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 30, 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=6.0.0 <6.0.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · .NET 6.0version=6.0.0 <6.0.24
Microsoft · Microsoft Visual Studio 2022 version 17.7version=17.7.0 <17.6.9
Microsoft · PowerShell 7.3version=7.3.0 <7.2.14
Microsoft · Microsoft Visual Studio 2022 version 17.6version=17.6.0 <17.6.9
Microsoft · Microsoft Visual Studio 2022 version 17.4version=17.4.0 <17.4.13
Microsoft · Microsoft Visual Studio 2022 version 17.2version=17.2.0 <17.2.21
Microsoft · .NET 7.0version=7.0.0 <7.0.13
Microsoft · PowerShell 7.2version=7.2.0 <7.2.14

Published CVSS scores

6.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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