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CVE-2021-34527
A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. In addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (Note: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ): HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting) UpdatePromptSettings = 0 (DWORD) or not defined (default setting) Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design. UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates. Note that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.
Dieser Datensatz: Live-Anbindung— zuletzt abgerufen: 7. November 2026 um 13:21.
Hersteller
Produkte
Windows 10, Windows 11, Windows Server
bis Version cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*
Veröffentlicht
3. Juli 2021
Zuletzt geändert
10. August 2026
Direkt aus NVD, CISA oder vom Hersteller übernommen — teils auf Englisch, unverändert gegenüber der Quelle.
A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. UPDATE July 7, 2021: The security update for Windows Server 2012, Windows Server 2016 and Windows 10, Version 1607 have been released. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. In addition to installing the updates, in order to secure your system, you must confirm that the following registry settings are set to 0 (zero) or are not defined (Note: These registry keys do not exist by default, and therefore are already at the secure setting.), also that your Group Policy setting are correct (see FAQ): HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting) UpdatePromptSettings = 0 (DWORD) or not defined (default setting) Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design. UPDATE July 6, 2021: Microsoft has completed the investigation and has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. If you are unable to install these updates, see the FAQ and Workaround sections in this CVE for information on how to help protect your system from this vulnerability. See also KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates. Note that the security updates released on and after July 6, 2021 contain protections for CVE-2021-1675 and the additional remote code execution exploit in the Windows Print Spooler service known as “PrintNightmare”, documented in CVE-2021-34527.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Privileges Required
LOW
User Interaction
NONE
Vertraulichkeit
Hoch
Integrität
Hoch
Verfügbarkeit
Hoch
Ausnutzungswahrscheinlichkeit innerhalb von 30 Tagen
99.8%
Perzentil
100e
Quelle: FIRST.org, aktualisiert am 6. November 2026.
Apply updates per vendor instructions.
Unsere eigene Einordnung und unser Kontext zu den obigen Quelldaten.
IACS-Radar-Einordnung
Unsere eigene Einordnung und unser Kontext zu dieser Schwachstelle — keine offizielle Quelle.
IACS-Radar-Prioritätswert
Basierend auf CVSS 8.8, EPSS 99.8%, industrielle Relevanz 30/100; angehoben wegen bestätigte aktive Ausnutzung (KEV).
Kombiniert CVSS, EPSS, KEV-Status, industrielle Relevanz und Expositionsrelevanz — eine Ergänzung, kein Ersatz für die einzelnen Werte darunter und darüber.
Voraussetzungen für eine Ausnutzung
Operative Auswirkungen & Energierelevanz
Möglicher Verlust der Sicht auf oder der Kontrolle über den Prozess bei erfolgreicher Ausnutzung.
Keine starken energiesektorspezifischen Signale erkannt; allgemeine OT-/ICS-Relevanz.
Empfohlene defensive Maßnahmen
Industrieller Relevanzwert
Die Einstufung ist vorläufig; eine manuelle Überprüfung durch einen OT-Security-Analysten wird empfohlen.
Klassifiziert von IACS Radar-analysepijplijn (geautomatiseerd) am 7. November 2026.
IEC-62443-Zuordnung
Automatische IACS-Radar-Einordnung anhand der gemeldeten CWE-Schwächeklassifizierung; keine offizielle Zertifizierungsaussage.