CVE-2024-43485Network attack vector

Service interruption via JsonExtensionData algorithmic complexity

Published Oct 8, 2024 · Updated Aug 19, 2026

Algorithmic complexity in System.Text.Json 6.0.x and 8.0.x allows remote attackers to exhaust service resources through crafted JSON. Deserialization of unmatched JSON properties into a model's JsonExtensionData dictionary takes attacker-amplified work; Microsoft has not published the exact internal operation. Exposure requires an application to deserialize untrusted JSON into a model using JsonExtensionData, and successful exploitation interrupts that application.

CVSS severity7.5
High
EPSS probability3.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithmic complexity in System.Text.Json 6.0.x and 8.0.x allows remote attackers to exhaust service resources through crafted JSON. Deserialization of unmatched JSON properties into a model's JsonExtensionData dictionary takes attacker-amplified work; Microsoft has not published the exact internal operation. Exposure requires an application to deserialize untrusted JSON into a model using JsonExtensionData, and successful exploitation interrupts that application.

The record

CVE
CVE-2024-43485
Published
Oct 8, 2024
Updated
Aug 19, 2026
Vendor
Microsoft
Product
.NET 6.0
Classifications
CWE-407, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record 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 <6.0.35

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · .NET 6.0version=6.0.0 <6.0.35
Microsoft · PowerShell 7.5version=7.5.0 <7.5.0
Microsoft · Microsoft Visual Studio 2022 version 17.10version=17.10 <17.10.8
Microsoft · Microsoft Visual Studio 2022 version 17.8version=17.8.0 <17.8.15
Microsoft · Microsoft Visual Studio 2022 version 17.6version=17.6.0 <17.6.20
Microsoft · .NET 8.0version=8.0.0 <8.0.10
Microsoft · Microsoft Visual Studio 2022 version 17.11version=17.11 <17.11.5
Microsoft · PowerShell 7.2version=7.2.0 <7.2.24
Microsoft · PowerShell 7.4version=7.4.0 <7.4.6

Published CVSS scores

7.5GitLab Advisory DatabaseCVSS: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-407Inefficient Algorithmic Complexity
T1499.002Service Exhaustion Flood

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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