Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Microsoft Windows 10 Version 1507 — Windows Print Spooler Remote Code Execution Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L L N U H H H 8.8 .9979 100.0 YES
AFFECTED
Product Versions Fixed
Windows 10 Version 1507 10.0.10240.0 – —
Windows 10 Version 1607 10.0.14393.0 – —
Windows 10 Version 1809 10.0.17763.0 – —
Windows 10 Version 1809 10.0.0 – —
Windows 10 Version 20H2 10.0.0 – —
Windows 10 Version 21H2 10.0.19044.0 – —
Windows 10 Version 22H2 10.0.19045.0 – —
Windows 11 version 21H2 10.0.22000.0 – —
Windows 11 version 22H2 10.0.22621.0 – —
Windows 8.1 6.3.0 – —
+ 14 more
TIMELINE
Jun 9 Reserved by microsoft
Nov 3 Added to CISA KEV, remediation due 2022-05-03
Nov 3 Published (CNA: microsoft)
Aug 10 EXPLOIT PUBLISHED — CVE-2021-34527 (Microsoft Windows 10 Version 1507). Public exploit reference added.
Description
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.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| June 9, 2021 | Reserved | Reserved by microsoft |
| November 3, 2021 | KEV ADDED | Added to CISA KEV, remediation due 2022-05-03 |
| November 3, 2021 | Published | Published (CNA: microsoft) |
| August 10, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2021-34527 (Microsoft Windows 10 Version 1507). Public exploit reference added. |
Affected
Affected products and packages — 24 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | Windows 10 Version 1507 | — | 10.0.10240.0 | — |
| Microsoft | Windows 10 Version 1607 | — | 10.0.14393.0 | — |
| Microsoft | Windows 10 Version 1809 | — | 10.0.17763.0 | — |
| Microsoft | Windows 10 Version 1809 | — | 10.0.0 | — |
| Microsoft | Windows 10 Version 20H2 | — | 10.0.0 | — |
| Microsoft | Windows 10 Version 21H2 | — | 10.0.19044.0 | — |
| Microsoft | Windows 10 Version 22H2 | — | 10.0.19045.0 | — |
| Microsoft | Windows 11 version 21H2 | — | 10.0.22000.0 | — |
| Microsoft | Windows 11 version 22H2 | — | 10.0.22621.0 | — |
| Microsoft | Windows 8.1 | — | 6.3.0 | — |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | — | 6.1.7601.0 | — |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | — | 6.1.7601.0 | — |
| Microsoft | Windows Server 2008 Service Pack 2 | — | 6.0.6003.0 | — |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | — | 6.0.6003.0 | — |
| Microsoft | Windows Server 2012 | — | 6.2.9200.0 | — |
| Microsoft | Windows Server 2012 (Server Core installation) | — | 6.2.9200.0 | — |
| Microsoft | Windows Server 2012 R2 | — | 6.3.9600.0 | — |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | — | 6.3.9600.0 | — |
| Microsoft | Windows Server 2016 | — | 10.0.14393.0 | — |
| Microsoft | Windows Server 2016 (Server Core installation) | — | 10.0.14393.0 | — |
| Microsoft | Windows Server 2019 | — | 10.0.17763.0 | — |
| Microsoft | Windows Server 2019 (Server Core installation) | — | 10.0.17763.0 | — |
| Microsoft | Windows Server 2022 | — | 10.0.20348.0 | — |
| Microsoft | Windows Server version 20H2 | — | 10.0.0 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-34527 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.