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CVE

CVE-2021-34527

First Reported
Aug 12, 2021
Latest Reported
Aug 12, 2021
Articles
1
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IOC
1
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CVE Enrichment

CVSS
8.8 HIGH
EPSS
99.79%
EPSS Percentile
99.96%
CISA KEV
YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version
3.1
CNA / NVD Source
secure@microsoft.com
Published
03-Jul-2021 05:15
Last Modified
11-Aug-2026 03:15
EPSS Date
2026-10-13

CVSS Vector

CVSS:3.1 AV:N / AC:L / PR:L / UI:N / S:U / C:H / I:H / A:H

CISA KEV Details

Date Added
2021-11-03
Remediation Due
2022-05-03
Known Ransomware Campaign Use
Known
Required Action
Apply updates per vendor instructions.
Notes
Reference CISA's ED 21-04 (https://www.cisa.gov/news-events/directives/ed-21-04-mitigate-windows-print-spooler-service-vulnerability) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-04. https://nvd.nist.gov/vuln/detail/CVE-2021-34527

Affected Products / Versions

References

Last enrichment sync: 14-Oct-2026 05:48
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE (1)

CVE-2021-16751 related article

People (3)

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Threat Actors (1)

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MITRE ATT&CK (16)

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Vendors (2)

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Products (10)

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Tools (4)

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Industries (1)

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Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.