CVE-2022-26832Network attack vector

Unauthenticated service interruption via undisclosed mechanism

Published Apr 15, 2022 · Updated Jan 2, 2025

Denial of service in affected Microsoft .NET Framework releases allows remote attackers to interrupt applications via network requests. Microsoft has not disclosed the affected component or the operation performed incorrectly on untrusted input, so the precise failure mechanism is unknown. The attack requires no authentication or user interaction; the documented impact is limited to availability, but Microsoft does not state whether the result is a hang, crash, or broader service outage.

CVSS severity7.5
High
EPSS probability3.61%
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 affected Microsoft .NET Framework releases allows remote attackers to interrupt applications via network requests. Microsoft has not disclosed the affected component or the operation performed incorrectly on untrusted input, so the precise failure mechanism is unknown. The attack requires no authentication or user interaction; the documented impact is limited to availability, but Microsoft does not state whether the result is a hang, crash, or broader service outage.

The record

CVE
CVE-2022-26832
Published
Apr 15, 2022
Updated
Jan 2, 2025
Vendor
Microsoft
Product
Microsoft .NET Framework 3.5 and 4.8
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 2025Record 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=4.8.0 <4.8.4494.03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft .NET Framework 3.5 and 4.8version=4.8.0 <4.8.4494.03
Microsoft · Microsoft .NET Framework 2.0 Service Pack 2version=2.0.0 <2.0.50727.8962
Microsoft · Microsoft .NET Framework 3.0 Service Pack 2version=3.0.0 <2.0.50727.8962
Microsoft · Microsoft .NET Framework 3.5.1version=3.5.0 <6.1.50727.8962
Microsoft · Microsoft .NET Framework 3.5 and 4.7.2version=4.7.0 <4.7.3930.02
Microsoft · Microsoft .NET Frameworkversion=3.0.0.0 <10.0.14393.5066; version=4.0.0.0 <4.0.52732.36732; version=4.0.0.0 <4.7.03930.02
Microsoft · Microsoft .NET Framework 3.5version=3.5.0 <publication
Microsoft · Microsoft .NET Framework 4.8version=4.8.0 <4.8.04494.03

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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

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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