CVE-2022-26929

Code execution via crafted file opened locally

Published Sep 13, 2022 · Updated Mar 11, 2025

Remote code execution in Microsoft .NET Framework allows attackers to run code when a local user opens a crafted file. Microsoft has not disclosed the affected parser, file format, or faulty operation performed on the crafted input. Exploitation requires user interaction and executes code with the privileges of the process that opens the file.

CVSS severity7.8
High
EPSS probability1.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft .NET Framework allows attackers to run code when a local user opens a crafted file. Microsoft has not disclosed the affected parser, file format, or faulty operation performed on the crafted input. Exploitation requires user interaction and executes code with the privileges of the process that opens the file.

The record

CVE
CVE-2022-26929
Published
Sep 13, 2022
Updated
Mar 11, 2025
Vendor
Microsoft
Product
Microsoft .NET Framework 3.5 and 4.8.1
Classifications
T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 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=4.8.1 <3.5.09082.05

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft .NET Framework 3.5 and 4.8.1version=4.8.1 <3.5.09082.05
Microsoft · Microsoft .NET Frameworkversion=10.0.0 <10.0.10240.19444; version=4.8.0.0 <4.8.04556.03

Published CVSS scores

7.8Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

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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