CVE-2020-0606Network attack vector

Code execution via unchecked source markup

Published Jan 14, 2020 · Updated Aug 4, 2024

Remote code execution in WPF file handling in Microsoft .NET allows remote attackers to run code as the current user via a crafted file. The WPF file-processing path fails to validate the file's source markup before interpreting it, allowing attacker-controlled markup to trigger code execution. Exploitation requires a user to open the file, and resulting code runs with that user's privileges.

CVSS severity8.8
High
EPSS probability17.19%
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 WPF file handling in Microsoft .NET allows remote attackers to run code as the current user via a crafted file. The WPF file-processing path fails to validate the file's source markup before interpreting it, allowing attacker-controlled markup to trigger code execution. Exploitation requires a user to open the file, and resulting code runs with that user's privileges.

The record

CVE
CVE-2020-0606
Published
Jan 14, 2020
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Microsoft .NET Framework 3.5.1
Classifications
CWE-20, T1204.002, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=Windows 7 for 32-bit Systems Service Pack 1
  2. Affected versionversion=Windows 7 for x64-based Systems Service Pack 1
  3. Affected versionversion=Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
  4. Affected versionversion=Windows Server 2008 R2 for x64-based Systems Service Pack 1
  5. Affected versionversion=Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft .NET Framework 3.5.1version=Windows 7 for 32-bit Systems Service Pack 1; version=Windows 7 for x64-based Systems Service Pack 1; version=Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1; version=Windows Server 2008 R2 for x64-based Systems Service Pack 1; version=Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Microsoft · Microsoft .NET Coreversion=3.0; version=3.1
Microsoft · Microsoft .NET Frameworkversion=1903; version=Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2; version=Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2; version=Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2; version=unspecified; version=Windows 7 for 32-bit Systems Service Pack 1; version=Windows 7 for x64-based Systems Service Pack 1; version=Windows 8.1 for 32-bit systems; version=Windows 8.1 for x64-based systems; version=Windows RT 8.1; version=Windows Server 2008 for 32-bit Systems Service Pack 2; version=Windows Server 2008 for x64-based Systems Service Pack 2; version=Windows Server 2008 R2 for x64-based Systems Service Pack 1; version=Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation); version=Windows Server 2012; version=Windows Server 2012 R2; version=Windows Server 2012 R2 (Server Core installation); version=Windows Server 2012 (Server Core installation)
Microsoft · Microsoft .NET Framework 3.5version=Windows 10 Version 1607 for 32-bit Systems; version=Windows 8.1 for 32-bit systems; version=Windows 8.1 for x64-based systems; version=Windows Server 2012; version=Windows Server 2012 R2; version=Windows Server 2012 R2 (Server Core installation); version=Windows Server 2012 (Server Core installation)

Published CVSS scores

9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:N/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 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
T1204.002Malicious File
T1203Exploitation for Client Execution

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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