CVE-2021-34527— Windows Print Spooler Remote Code Execution Vulnerability
Quick assessment
Affected
Microsoft Windows 10 Version 1507
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Microsoft Windows Print Spooler Components是美国微软（Microsoft）公司的一个打印后台处理程序组件。 Microsoft Windows Print Spooler Components 存在安全漏洞，攻击者可以通过该漏洞绕过PfcAddPrinterDriver的安全验证，并在打印服务器中安装恶意的驱动程序。以下产品和版本受到影响:Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1
Public Exploits 1
Metasploit · 1
cve_2021_1675_printnightmare.rb#CVE-2021-34527 [exploit]
In-the-Wild Activity Observed
cisa_kev · confirmed
Possible ATT&CK Techniques 3 AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application T1210 · Exploitation of Remote ServicesAffected Version Matrix 24
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 10 Version 1507 | 10.0.10240.0< 10.0.10240.18969 |
affected |
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0< 10.0.14393.4470 |
affected |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0< 10.0.17763.2029 |
affected |
10.0.0< 10.0.17763.2029 |
affected | ||
| Microsoft | Windows 10 Version 20H2 | 10.0.0< 10.0.19042.1083 |
affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0< 10.0.19044.1415 |
affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0< 10.0.19045.2251 |
affected |
| Microsoft | Windows 11 version 21H2 | 10.0.22000.0< 10.0.22000.318 |
affected |
| Microsoft | Windows 11 version 22H2 | 10.0.22621.0< 10.0.22621.674 |
affected |
| Microsoft | Windows 8.1 | 6.3.0< 6.3.9600.20046 |
affected |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.7601.0< 6.1.7601.25633 |
affected |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | 6.1.7601.0< 6.1.7601.25633 |
affected |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.6003.0< 6.0.6003.21138 |
affected |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | 6.0.6003.0< 6.0.6003.21138 |
affected |
| Microsoft | Windows Server 2012 | 6.2.9200.0< 6.2.9200.23383 |
affected |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0< 6.2.9200.23383 |
affected |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0< 6.3.9600.20046 |
affected |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0< 6.3.9600.20046 |
affected |
| Microsoft | Windows Server 2016 | 10.0.14393.0< 10.0.14393.4470 |
affected |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0< 10.0.14393.4470 |
affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0< 10.0.17763.2029 |
affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0< 10.0.17763.2029 |
affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0< 10.0.20348.230 |
affected |
| Microsoft | Windows Server version 20H2 | 10.0.0< 10.0.19042.1083 |
affected |
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2021-34527
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Windows Print Spooler Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Print Spooler Components 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Print Spooler Components是美国微软（Microsoft）公司的一个打印后台处理程序组件。 Microsoft Windows Print Spooler Components 存在安全漏洞，攻击者可以通过该漏洞绕过PfcAddPrinterDriver的安全验证，并在打印服务器中安装恶意的驱动程序。以下产品和版本受到影响:Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
II. Public POCs for CVE-2021-34527
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Small Powershell Script to detect Running Printer Spoolers on Domain Controller | https://github.com/DenizSe/CVE-2021-34527 | POC Details |
| 2 | Kritische Sicherheitslücke PrintNightmare CVE-2021-34527 | https://github.com/glshnu/PrintNightmare | POC Details |
| 3 | None | https://github.com/JohnHammond/CVE-2021-34527 | POC Details |
| 4 | PrintNightmare - Windows Print Spooler RCE/LPE Vulnerability (CVE-2021-34527, CVE-2021-1675) proof of concept exploits | https://github.com/nemo-wq/PrintNightmare-CVE-2021-34527 | POC Details |
| 5 | Cve-2021-1675 or cve-2021-34527? Detailed analysis and exploitation of windows print spooler 0day vulnerability！！！ | https://github.com/CnOxx1/CVE-2021-34527-1675 | POC Details |
| 6 | Workaround for Windows Print Spooler Remote Code Execution Vulnerability(CVE-2021-34527). See: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527 | https://github.com/rdboboia/disable-RegisterSpoolerRemoteRpcEndPoint | POC Details |
| 7 | This simple PowerShell script is in response to the "PrintNightmare" vulnerability. This was designed to give a end user the ability to stop and disable the "Print Spooler" service on their computer while awaiting a fix from Microsoft. | https://github.com/geekbrett/CVE-2021-34527-PrintNightmare-Workaround | POC Details |
| 8 | A PrintNightmare (CVE-2021-34527) Python Scanner. Scan entire subnets for hosts vulnerable to the PrintNightmare RCE | https://github.com/byt3bl33d3r/ItWasAllADream | POC Details |
| 9 | Simple batch script to disable the Microsoft Print Spooler service from system | https://github.com/vinaysudheer/Disable-Spooler-Service-PrintNightmare-CVE-2021-34527 | POC Details |
| 10 | How to fix the PrintNightmare vulnerability | https://github.com/powershellpr0mpt/PrintNightmare-CVE-2021-34527 | POC Details |
| 11 | Mitigation for CVE-2021-34527 RCE by setting WRITE ACLs | https://github.com/WidespreadPandemic/CVE-2021-34527_ACL_mitigation | POC Details |
| 12 | CVE-2021-34527 implementation | https://github.com/glorisonlai/printnightmare | POC Details |
| 13 | None | https://github.com/dywhoami/CVE-2021-34527-Scanner-Based-On-cube0x0-POC | POC Details |
| 14 | Fix for PrintNightmare CVE-2021-34527 | https://github.com/Eutectico/Printnightmare | POC Details |
| 15 | A collection of scripts to help set the appropriate registry keys for CVE-2021-34527 | https://github.com/syntaxbearror/PowerShell-PrintNightmare | POC Details |
| 16 | A patch for PrintNightmare vulnerability that occurs to print spooler service for Windows machines [CVE-2021-34527] | https://github.com/0xirison/PrintNightmare-Patcher | POC Details |
| 17 | To fight against Windows security breach PrintNightmare! (CVE-2021-34527, CVE-2021-1675) | https://github.com/Tomparte/PrintNightmare | POC Details |
| 18 | None | https://github.com/Amaranese/CVE-2021-34527 | POC Details |
| 19 | None | https://github.com/cyb3rpeace/CVE-2021-34527 | POC Details |
| 20 | PrintNightmare (CVE-2021-34527) PoC Exploit | https://github.com/m8sec/CVE-2021-34527 | POC Details |
| 21 | CVE-2021-34527 AddPrinterDriverEx() Privilege Escalation | https://github.com/hackerhouse-opensource/cve-2021-34527 | POC Details |
| 22 | # Fix-CVE-2021-34527 Fix for the security Script Changes ACL in the directory Stop Service PrintSpooler Spooler Changes StartupType to Disabled Add every server in the serverlist.csv and run script. | https://github.com/fardinbarashi/PsFix-CVE-2021-34527 | POC Details |
| 23 | CVE-2021-34527 PrintNightmare PoC | https://github.com/d0rb/CVE-2021-34527 | POC Details |
| 24 | detect bruteforce using for cve-2021-34527 | https://github.com/TieuLong21Prosper/detect_bruteforce | POC Details |
| 25 | Kritische Sicherheitslücke PrintNightmare CVE-2021-34527 | https://github.com/thomas-lauer/PrintNightmare | POC Details |
| 26 | None | https://github.com/Hirusha-N/CVE-2021-34527-CVE-2023-38831-and-CVE-2023-32784 | POC Details |
| 27 | CVE-2021-34527 is a critical remote code execution and local privilege escalation vulnerability dubbed "PrintNightmare." | https://github.com/AUSK1LL9/CVE-2021-34527 | POC Details |
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2021-34527
请登录查看更多情报信息。
Vendor Advisories for CVE-2021-34527 (1)
Exploits & Public PoCs for CVE-2021-34527 (1)
IV. Related Vulnerabilities
Same product: Windows 10 Version 1507
-
CVE-2025-64680
Windows DWM Core Library Elevation of Privilege Vulnerabilit -
CVE-2025-64679
Windows DWM Core Library Elevation of Privilege Vulnerabilit -
CVE-2025-62209
Windows License Manager Information Disclosure Vulnerability -
CVE-2025-62208
Windows License Manager Information Disclosure Vulnerability -
CVE-2025-59278
Windows Authentication Elevation of Privilege Vulnerability
Same vendor: Microsoft
-
CVE-2026-62316
Microsoft UFO: DNS Rebinding → Unauthenticated File Read / C -
CVE-2026-69502
Azure SQL Database Elevation of Privilege Vulnerability -
CVE-2026-69855
Microsoft Copilot in Azure Information Disclosure Vulnerabil -
CVE-2026-69543
Azure Virtual Machines Elevation of Privilege Vulnerability -
CVE-2026-69558
Microsoft Partner Center Information Disclosure Vulnerabilit
V. Comments for CVE-2021-34527
No comments yet