All vulnerabilities
CVE-2021-34527

Microsoft Windows Print Spooler Remote Code Execution Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationExploited in the wildAdded to KEV 3 Nov 2021. Known ransomware useCISA KEV
Exploit odds (EPSS)99.8%Chance of exploitation activity in the next 30 days, higher than 99.9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.10240.18969Also 10.0.14393.4470, 10.0.17763.2029 and 10 moreCVE List
Federal deadline3 May 2022Remediation due date for US federal agenciesCISA KEV
CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

  • 10.0.10240.18969Windows 10 Version 1507CVE List
  • 10.0.14393.4470Windows 10 Version 1607CVE List
  • 10.0.17763.2029Windows 10 Version 1809CVE List
  • 10.0.19042.1083Windows 10 Version 20H2CVE List
  • 10.0.19044.1415Windows 10 Version 21H2CVE List
  • 10.0.19045.2251Windows 10 Version 22H2CVE List
Show all 23 fixed versions
  • 10.0.22000.318Windows 11 version 21H2CVE List
  • 10.0.22621.674Windows 11 version 22H2CVE List
  • 6.3.9600.20046Windows 8.1CVE List
  • 6.1.7601.25633Windows Server 2008 R2 Service Pack 1CVE List
  • 6.1.7601.25633Windows Server 2008 R2 Service Pack 1 (Server Core installation)CVE List
  • 6.0.6003.21138Windows Server 2008 Service Pack 2CVE List
  • 6.0.6003.21138Windows Server 2008 Service Pack 2 (Server Core installation)CVE List
  • 6.2.9200.23383Windows Server 2012CVE List
  • 6.2.9200.23383Windows Server 2012 (Server Core installation)CVE List
  • 6.3.9600.20046Windows Server 2012 R2CVE List
  • 6.3.9600.20046Windows Server 2012 R2 (Server Core installation)CVE List
  • 10.0.14393.4470Windows Server 2016CVE List
  • 10.0.14393.4470Windows Server 2016 (Server Core installation)CVE List
  • 10.0.17763.2029Windows Server 2019CVE List
  • 10.0.17763.2029Windows Server 2019 (Server Core installation)CVE List
  • 10.0.20348.230Windows Server 2022CVE List
  • 10.0.19042.1083Windows Server version 20H2CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 8 Jun 2021Exploit code publicMetasploit
  2. 2 Jul 2021, 21:25 UTCPublishedCVE List
  3. 3 Nov 2021Added to CISA KEVCISA KEV

Public exploit code and templates 1

  • Exploit modulePrint Spooler Remote DLL Injection 8 Jun 2021Metasploit

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

Microsoft Windows Print Spooler contains an unspecified vulnerability due to the Windows Print Spooler service improperly performing privileged file operations. Successful exploitation allows an attacker to perform remote code execution with SYSTEM privileges. The vulnerability is also known under the moniker of PrintNightmare.

Text from CVE List

Affected versions 24

  • Windows 10 Version 1507affected: 10.0.10240.0 before 10.0.10240.18969CVE List
  • Windows 10 Version 1607affected: 10.0.14393.0 before 10.0.14393.4470CVE List
  • Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.2029CVE List
  • Windows 10 Version 1809affected: 10.0.0 before 10.0.17763.2029CVE List
  • Windows 10 Version 20H2affected: 10.0.0 before 10.0.19042.1083CVE List
  • Windows 10 Version 21H2affected: 10.0.19044.0 before 10.0.19044.1415CVE List
  • Windows 10 Version 22H2affected: 10.0.19045.0 before 10.0.19045.2251CVE List
  • Windows 11 version 21H2affected: 10.0.22000.0 before 10.0.22000.318CVE List
  • Windows 11 version 22H2affected: 10.0.22621.0 before 10.0.22621.674CVE List
  • Windows 8.1affected: 6.3.0 before 6.3.9600.20046CVE List
  • Windows Server 2008 R2 Service Pack 1affected: 6.1.7601.0 before 6.1.7601.25633CVE List
  • Windows Server 2008 R2 Service Pack 1 (Server Core installation)affected: 6.1.7601.0 before 6.1.7601.25633CVE List
  • Windows Server 2008 Service Pack 2affected: 6.0.6003.0 before 6.0.6003.21138CVE List
  • Windows Server 2008 Service Pack 2 (Server Core installation)affected: 6.0.6003.0 before 6.0.6003.21138CVE List
  • Windows Server 2012affected: 6.2.9200.0 before 6.2.9200.23383CVE List
  • Windows Server 2012 (Server Core installation)affected: 6.2.9200.0 before 6.2.9200.23383CVE List
  • Windows Server 2012 R2affected: 6.3.9600.0 before 6.3.9600.20046CVE List
  • Windows Server 2012 R2 (Server Core installation)affected: 6.3.9600.0 before 6.3.9600.20046CVE List
  • Windows Server 2016affected: 10.0.14393.0 before 10.0.14393.4470CVE List
  • Windows Server 2016 (Server Core installation)affected: 10.0.14393.0 before 10.0.14393.4470CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.2029CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.2029CVE List
  • Windows Server 2022affected: 10.0.20348.0 before 10.0.20348.230CVE List
  • Windows Server version 20H2affected: 10.0.0 before 10.0.19042.1083CVE List

References 6