CVE-2024-38095Network attack vector

Service interruption via excessive X.509 parsing

Published Jul 9, 2024 · Updated Dec 9, 2025

Improper input validation in Microsoft .NET and Visual Studio allows remote attackers to interrupt service with malicious X.509 certificates. System.Formats.Asn1 performs computationally excessive parsing when an X.509 certificate or certificate collection contains maliciously crafted data. No authentication or user interaction is required, and the resulting CPU exhaustion can make a process unavailable on any supported platform.

CVSS severity7.5
High
EPSS probability2.74%
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 Microsoft .NET and Visual Studio allows remote attackers to interrupt service with malicious X.509 certificates. System.Formats.Asn1 performs computationally excessive parsing when an X.509 certificate or certificate collection contains maliciously crafted data. No authentication or user interaction is required, and the resulting CPU exhaustion can make a process unavailable on any supported platform.

The record

CVE
CVE-2024-38095
Published
Jul 9, 2024
Updated
Dec 9, 2025
Vendor
Microsoft
Product
.NET 6.0
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 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=6.0.0 <6.0.32

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · .NET 6.0version=6.0.0 <6.0.32
Microsoft · Microsoft Visual Studio 2022 version 17.10version=17.10 <17.10.4
Microsoft · Microsoft Visual Studio 2022 version 17.8version=17.8.0 <17.8.12
Microsoft · Microsoft Visual Studio 2022 version 17.6version=17.6.0 <17.6.17
Microsoft · Microsoft Visual Studio 2022 version 17.4version=17.4.0 <17.4.21
Microsoft · .NET 8.0version=8.0 <8.0.7
Microsoft · PowerShell 7.2version=7.2.0 <7.2.22
Microsoft · PowerShell 7.4version=7.4.0 <7.4.4

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 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-20Improper Input Validation
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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