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

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 85.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-08 · updated 2026-08-12

Description

Windows Print Spooler Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 Version 1507: before 10.0.10240.18967 — fixed in 10.0.10240.18967
• Microsoft Windows 10 1607: before 10.0.14393.4467 — fixed in 10.0.14393.4467
• Microsoft Windows 10: before 10.0.17763.1999 — fixed in 10.0.17763.1999
• Microsoft Windows 10 1909: before 10.0.18363.1621 — fixed in 10.0.18363.1621
• Microsoft Windows 10 2004: before 10.0.19041.1052 — fixed in 10.0.19041.1052
• Microsoft Windows 10 20H2: before 10.0.19042.1052 — fixed in 10.0.19042.1052
• Microsoft Windows 10 21H1: before 10.0.19043.1052 — fixed in 10.0.19043.1052
• Microsoft Windows 7: all versions
• Microsoft Windows 8.1: all versions
• Microsoft Windows RT 8.1: all versions
• Microsoft Windows Server 2004: before 10.0.19041.1052 — fixed in 10.0.19041.1052
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Windows Server 2012: r2
• Microsoft Windows Server 2016: before 10.0.14393.4467 — fixed in 10.0.14393.4467
• Microsoft Windows Server 2019: before 10.0.17763.1999 — fixed in 10.0.17763.1999
• Microsoft Windows 10 Version 1507: from 10.0.0 before 10.0.10240.18967 — fixed in 10.0.10240.18967
• Microsoft Windows 10 1607: from 10.0.0 before 10.0.14393.4467 — fixed in 10.0.14393.4467
• Microsoft Windows 10: from 10.0.0 before 10.0.17763.1999 — fixed in 10.0.17763.1999
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1621 — fixed in 10.0.18363.1621
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1052 — fixed in 10.0.19041.1052
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1052 — fixed in 10.0.19042.1052
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1052 — fixed in 10.0.19043.1052
• Microsoft Windows 7: from 6.1.0 before 6.1.7601.25632 — fixed in 6.1.7601.25632
• Microsoft Windows 7 Service Pack 1: from 6.1.0 before 6.1.7601.25632 — fixed in 6.1.7601.25632
• Microsoft Windows 8.1: from 6.3.0 before 6.3.9600.20045; from 6.3.0 before 6.3.9600.20044 — fixed in 6.3.9600.20045, 6.3.9600.20044
• Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.0 before 6.1.7601.25632 — fixed in 6.1.7601.25632
• Microsoft Windows Server 2008 Service Pack 2: from 6.0.0 before 6.0.6003.21137 — fixed in 6.0.6003.21137
• Microsoft Windows Server 2012: from 6.2.0 before 6.2.9200.23372 — fixed in 6.2.9200.23372
• Microsoft Windows Server 2012 R2: from 6.3.0 before 6.3.9600.20045; from 6.3.0 before 6.3.9600.20044 — fixed in 6.3.9600.20045, 6.3.9600.20044
• Microsoft Windows Server 2016: from 10.0.0 before 10.0.14393.4467 — fixed in 10.0.14393.4467

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.18967; Microsoft Windows 10 1607 10.0.14393.4467; Microsoft Windows 10 10.0.17763.1999; Microsoft Windows 10 1909 10.0.18363.1621; Microsoft Windows 10 2004 10.0.19041.1052; Microsoft Windows 10 20H2 10.0.19042.1052; Microsoft Windows 10 21H1 10.0.19043.1052; Microsoft Windows Server 2004 10.0.19041.1052; Microsoft Windows Server 2016 10.0.14393.4467; Microsoft Windows Server 2019 10.0.17763.1999; Microsoft Windows 10 Version 1507 10.0.10240.18967; Microsoft Windows 10 1607 10.0.14393.4467. Check the vendor advisory for mitigations.

References

• 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
• 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
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1675
• https://www.kb.cert.org/vuls/id/383432
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1675

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