How severe is GHSA-3gp9-h8hw-pxpw?

GHSA-3gp9-h8hw-pxpw has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-3gp9-h8hw-pxpw?

GHSA-3gp9-h8hw-pxpw affects the following packages: Microsoft.NETCore.App (NuGet), Microsoft.NETCore.App.Host.linux-arm (NuGet), Microsoft.NETCore.App.Host.linux-arm64 (NuGet), Microsoft.NETCore.App.Host.linux-musl-arm64 (NuGet), Microsoft.NETCore.App.Host.linux-musl-x64 (NuGet), Microsoft.NETCore.App.Host.linux-x64 (NuGet), Microsoft.NETCore.App.Host.osx-x64 (NuGet), Microsoft.NETCore.App.Host.rhel.6-x64 (NuGet), and 47 more. Ecosystems affected: NuGet.

How do I fix GHSA-3gp9-h8hw-pxpw?

Update Microsoft.NETCore.App to 2.1.25 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3gp9-h8hw-pxpw is resolved across your whole dependency graph.

How do I detect GHSA-3gp9-h8hw-pxpw in my NuGet dependencies?

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

How do I mitigate GHSA-3gp9-h8hw-pxpw if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is GHSA-3gp9-h8hw-pxpw actively exploited in the wild?

No public exploit code has been indexed for GHSA-3gp9-h8hw-pxpw 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 GHSA-3gp9-h8hw-pxpw?

GHSA-3gp9-h8hw-pxpw has an EPSS (Exploit Prediction Scoring System) score of 3.3%, placing it in the 89th 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 indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was GHSA-3gp9-h8hw-pxpw published, and has it been updated?

GHSA-3gp9-h8hw-pxpw was published on May 24, 2022 and was last updated on November 29, 2024. 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

MEDIUM severity

Denial of service in .NET coreGHSA-3gp9-h8hw-pxpw

MEDIUM

GHSA-3gp9-h8hw-pxpw is a medium-severity (CVSS 6.5) vulnerability in Microsoft.NETCore.App. A fix is available for Microsoft.NETCore.App — see the affected versions and patch details below.

Also known asBIT-dotnet-2021-1721BIT-dotnet-sdk-2021-1721CVE-2021-1721

Published

May 24, 2022

Updated

Nov 29, 2024

Affected

55 pkgs

Patched

55 / 55

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-3gp9-h8hw-pxpw.

EPSS Exploitation Probability

via FIRST.org ↗

3.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs89th percentile — riskier than 89% 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

55 pkgs affected

.NETMicrosoft.NETCore.App.NETMicrosoft.NETCore.App.Host.linux-arm.NETMicrosoft.NETCore.App.Host.linux-arm64.NETMicrosoft.NETCore.App.Host.linux-musl-arm64.NETMicrosoft.NETCore.App.Host.linux-musl-x64.NETMicrosoft.NETCore.App.Host.linux-x64.NETMicrosoft.NETCore.App.Host.osx-x64.NETMicrosoft.NETCore.App.Host.rhel.6-x64+47 more

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

.NET Core and Visual Studio Denial of Service Vulnerability due to a vulnerability which exists when creating HTTPS web request during X509 certificate chain building.

Affected Packages

55 total 55 fixed

Ecosystem	Package	Vulnerable range	Fix
.NETNuGet	`Microsoft.NETCore.App`	≥ 2.1.0&&< 2.1.25	2.1.25`dotnet add package Microsoft.NETCore.App --version 2.1.25`
.NETNuGet	`Microsoft.NETCore.App.Host.linux-arm`	≥ 3.1.0&&< 3.1.12	3.1.12`dotnet add package Microsoft.NETCore.App.Host.linux-arm --version 3.1.12`
.NETNuGet	`Microsoft.NETCore.App.Host.linux-arm64`	≥ 3.1.0&&< 3.1.12	3.1.12`dotnet add package Microsoft.NETCore.App.Host.linux-arm64 --version 3.1.12`
.NETNuGet	`Microsoft.NETCore.App.Host.linux-musl-arm64`	≥ 3.1.0&&< 3.1.12	3.1.12`dotnet add package Microsoft.NETCore.App.Host.linux-musl-arm64 --version 3.1.12`
.NETNuGet	`Microsoft.NETCore.App.Host.linux-musl-x64`	≥ 3.1.0&&< 3.1.12	3.1.12`dotnet add package Microsoft.NETCore.App.Host.linux-musl-x64 --version 3.1.12`
.NETNuGet	`Microsoft.NETCore.App.Host.linux-x64`	≥ 3.1.0&&< 3.1.12	3.1.12`dotnet add package Microsoft.NETCore.App.Host.linux-x64 --version 3.1.12`

Affected Products

5 products · 7 configurations

Application

.netmicrosoft

≥ 5.0 && ≤ 5.0.2

range

Application

.net coremicrosoft

≥ 3.1 && ≤ 3.1.11

range

Application

powershell coremicrosoft

2 versions

7.07.1

Application

visual studio 2017microsoft

≥ 15.0 && ≤ 15.9

range

Application

visual studio 2019microsoft

≥ 16.0 && ≤ 16.8

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.NETCore.App, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Microsoft.NETCore.App to 2.1.25 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3gp9-h8hw-pxpw is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

Product	Fixed in	Advisory
.NET Core on Red Hat Enterprise Linux	`rh-dotnet21-0:2.1-24.el7_9`	RHSA-2021:0470
.NET Core on Red Hat Enterprise Linux	`rh-dotnet31-dotnet-0:3.1.112-1.el7_9`	RHSA-2021:0472
.NET Core on Red Hat Enterprise Linux	`rh-dotnet50-dotnet-0:5.0.103-1.el7_9`	RHSA-2021:0473
Red Hat Enterprise Linux 8	`dotnet3.1-0:3.1.112-1.el8_3`	RHSA-2021:0471
Red Hat Enterprise Linux 8	`dotnet-0:2.1.521-1.el8_3`	RHSA-2021:0474
Red Hat Enterprise Linux 8	`dotnet5.0-0:5.0.103-1.el8_3`	RHSA-2021:0476

Frequently Asked Questions

.NET Core and Visual Studio Denial of Service Vulnerability due to a vulnerability which exists when creating HTTPS web request during X509 certificate chain building.

O3 Security · Impact-Aware SCA

Is GHSA-3gp9-h8hw-pxpw in your dependencies?

Find it across NuGet, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.5/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Raw vector

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

Weaponization

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

Timeline

Disclosed

May 24, 2022

Last updated

Nov 29, 2024

Identifiers

GHSA-3gp9-h8hw-pxpw

BIT-dotnet-2021-1721

BIT-dotnet-sdk-2021-1721

References

Advisorynvd.nist.gov · CVE 2021 1721 Webgithub.com Webgithub.com Webportal.msrc.microsoft.com · CVE 2021 1721

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting Microsoft.NETCore.App are rated as high or higher (top: high).

CVE-2021-34485CVE-2021-1721CVE-2020-1108CVE-2020-1147CVE-2017-8585CVE-2019-0545CVE-2019-0564CVE-2019-0657

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedNov 29, 2024

Denial of service in .NET coreGHSA-3gp9-h8hw-pxpw

Exploitation Status

No confirmed exploitation observed yet

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

Fixing This On Your OS

Frequently Asked Questions

Is GHSA-3gp9-h8hw-pxpw in your dependencies?