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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

CVE-2019-0980 — System.Private.Uri

HIGH

CVE-2019-0980 is a high-severity (CVSS 7.5) CWE-19 vulnerability in System.Private.Uri. A fix is available for System.Private.Uri — see the affected versions and patch details below.

Denial of service in ASP.NET Core

Also known asGHSA-xhfc-gr8f-ffwc
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
5.0%probability of exploitation in next 30 days
Lower Risk+0.04%
Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk
2.46%3.80%5.14%6.48%3.2%5.0%May 26Sep 26Nov 26

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

1 pkg affected
.NETSystem.Private.Uri

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 denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0820, CVE-2019-0981.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetSystem.Private.Uri≥ 4.3.0&&< 4.3.24.3.2dotnet add package System.Private.Uri --version 4.3.2

Affected Products

2 products · 28 configurations
Application
.net coremicrosoft
4 versions
1.01.12.12.2
Application
.net frameworkmicrosoft
12 versions
2.03.03.53.5.14.5.24.64.6.14.6.24.74.7.14.7.24.8

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update System.Private.Uri to 4.3.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-0980 is resolved across your whole dependency graph.

  3. 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 HatModerate
ProductFixed inAdvisory
.NET Core on Red Hat Enterprise Linuxrh-dotnet21-0:2.1-10.el7RHSA-2019:1236
Red Hat Enterprise Linux 8dotnet-0:2.1.507-2.el8_0RHSA-2019:1259

Frequently Asked Questions

A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core Denial of Service Vulnerability'. This CVE ID is unique from CVE-2019-0820, CVE-2019-0981.
O3 Security · Impact-Aware SCA

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CVE-2019-0980: System.Private.Uri DoS — Fixed in 4.3.2