How severe is CVE-2020-0606?

CVE-2020-0606 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2020-0606?

CVE-2020-0606 affects the following packages: Microsoft.WindowsDesktop.App.Ref (NuGet), Microsoft.WindowsDesktop.App.Ref (NuGet), Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet), Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet), Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet), Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet). Ecosystems affected: NuGet.

How do I fix CVE-2020-0606?

Update Microsoft.WindowsDesktop.App.Ref to 3.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-0606 is resolved across your whole dependency graph.

How do I detect CVE-2020-0606 in my NuGet dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.WindowsDesktop.App.Ref, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2020-0606 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2020-0606 actively exploited in the wild?

No public exploit code has been indexed for CVE-2020-0606 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2020-0606?

CVE-2020-0606 has an EPSS (Exploit Prediction Scoring System) score of 17.2%, placing it in the 97th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

What type of vulnerability is CVE-2020-0606?

CVE-2020-0606 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2020-0606 published, and has it been updated?

CVE-2020-0606 was published on January 14, 2020 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

.NET

.NET NuGet

Not in CISA KEV

HIGH severity

CVE-2020-0606 — Microsoft.WindowsDesktop.…

HIGH

CVE-2020-0606 is a high-severity (CVSS 8.8) Improper Input Validation vulnerability in Microsoft.WindowsDesktop.App.Ref. EPSS puts its 30-day exploitation probability at 17.2% (97th percentile). A fix is available for Microsoft.WindowsDesktop.App.Ref — see the affected versions and patch details below.

Remote code execution in Microsoft.WindowsDesktop.App.Ref

Also known asGHSA-r4mw-gxf7-vxr9

Published

Jan 14, 2020

Updated

Oct 24, 2026

Affected

6 pkgs

Patched

6 / 6

Exploits

None indexed

Exploitation data as of Oct 31, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

17.2%probability of exploitation in next 30 days

Moderate Risk0.00%

Lower risk than most CVEs97th percentile — riskier than 97% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

6 pkgs affected

.NETMicrosoft.WindowsDesktop.App.Ref.NETMicrosoft.WindowsDesktop.App.Ref.NETMicrosoft.WindowsDesktop.App.Runtime.win-x86.NETMicrosoft.WindowsDesktop.App.Runtime.win-x86.NETMicrosoft.WindowsDesktop.App.Runtime.win-x64.NETMicrosoft.WindowsDesktop.App.Runtime.win-x64

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

A remote code execution vulnerability exists in .NET software when the software fails to check the source markup of a file.An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user, aka '.NET Framework Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-0605.

Affected Packages

6 total 6 fixed

Ecosystem	Package	Vulnerable range	Fix
.NETNuGet	`Microsoft.WindowsDesktop.App.Ref`	≥ 3.0.1&&< 3.0.2	3.0.2`dotnet add package Microsoft.WindowsDesktop.App.Ref --version 3.0.2`
.NETNuGet	`Microsoft.WindowsDesktop.App.Ref`	≥ 3.1.0&&< 3.1.1	3.1.1`dotnet add package Microsoft.WindowsDesktop.App.Ref --version 3.1.1`
.NETNuGet	`Microsoft.WindowsDesktop.App.Runtime.win-x86`	≥ 3.0.0&&< 3.0.2	3.0.2`dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x86 --version 3.0.2`
.NETNuGet	`Microsoft.WindowsDesktop.App.Runtime.win-x86`	≥ 3.1.0&&< 3.1.11	3.1.11`dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x86 --version 3.1.11`
.NETNuGet	`Microsoft.WindowsDesktop.App.Runtime.win-x64`	≥ 3.0.0&&< 3.0.2	3.0.2`dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x64 --version 3.0.2`
.NETNuGet	`Microsoft.WindowsDesktop.App.Runtime.win-x64`	≥ 3.1.0&&< 3.1.11	3.1.11`dotnet add package Microsoft.WindowsDesktop.App.Runtime.win-x64 --version 3.1.11`

Affected Products

2 products · 23 configurations

Application

.net coremicrosoft

2 versions

3.03.1

Application

.net frameworkmicrosoft

11 versions

3.03.53.5.14.5.24.64.6.14.6.24.74.7.14.7.24.8

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.WindowsDesktop.App.Ref, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Microsoft.WindowsDesktop.App.Ref to 3.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-0606 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2020-0606 in your dependencies?

Find it across NuGet, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

8.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE Classification

CWE-20Improper Input Validation

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Jan 14, 2020

Last updated

Oct 24, 2026

Identifiers

CVE-2020-0606

GHSA-r4mw-gxf7-vxr9

References

Advisorynvd.nist.gov · CVE 2020 0606 Fixportal.msrc.microsoft.com · CVE 2020 0606 Webgithub.com Webgithub.com

Related vulnerabilities

This CVE is high severity; 6 of 8 other CVEs affecting Microsoft.WindowsDesktop.App.Runtime.win-x86 are rated as high or higher (top: high).

CVE-2026-70035CVE-2026-83520CVE-2026-96229CVE-2026-87697CVE-2026-85363CVE-2026-70174CVE-2026-96232CVE-2026-96234

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026

CVE-2020-0606 — Microsoft.WindowsDesktop.…

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2020-0606 in your dependencies?