// For flags

CVE-2021-34527

Microsoft Windows Print Spooler Remote Code Execution Vulnerability

Severity Score

8.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

16
*Multiple Sources

Exploited in Wild

Yes
*KEV

Decision

Act
*SSVC
Descriptions

<p>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.</p>
<p>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.</p>
<p>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 (<strong>Note</strong>: 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):</p>
<ul>
<li>HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Printers\PointAndPrint</li>
<li>NoWarningNoElevationOnInstall = 0 (DWORD) or not defined (default setting)</li>
<li>UpdatePromptSettings = 0 (DWORD) or not defined (default setting)</li>
</ul>
<p><strong>Having NoWarningNoElevationOnInstall set to 1 makes your system vulnerable by design.</strong></p>
<p>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 <a href="https://support.microsoft.com/topic/31b91c02-05bc-4ada-a7ea-183b129578a7">KB5005010: Restricting installation of new printer drivers after applying the July 6, 2021 updates</a>.</p>
<p>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.</p>

Una vulnerabilidad en la ejecución de código remota de Windows Print Spooler

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.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Act
Exploitation
Active
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2021-06-09 CVE Reserved
  • 2021-07-02 CVE Published
  • 2021-07-02 First Exploit
  • 2021-07-20 KEV Due Date
  • 2021-11-03 Exploited in Wild
  • 2024-08-04 CVE Updated
  • 2024-11-04 EPSS Updated
CWE
  • CWE-269: Improper Privilege Management
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Microsoft
Search vendor "Microsoft"
Windows 10 1507
Search vendor "Microsoft" for product "Windows 10 1507"
< 10.0.10240.18969
Search vendor "Microsoft" for product "Windows 10 1507" and version " < 10.0.10240.18969"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 10 1607
Search vendor "Microsoft" for product "Windows 10 1607"
< 10.0.14393.4470
Search vendor "Microsoft" for product "Windows 10 1607" and version " < 10.0.14393.4470"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 10 1809
Search vendor "Microsoft" for product "Windows 10 1809"
< 10.0.17763.2029
Search vendor "Microsoft" for product "Windows 10 1809" and version " < 10.0.17763.2029"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 10 20h2
Search vendor "Microsoft" for product "Windows 10 20h2"
< 10.0.19042.1083
Search vendor "Microsoft" for product "Windows 10 20h2" and version " < 10.0.19042.1083"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 10 21h2
Search vendor "Microsoft" for product "Windows 10 21h2"
< 10.0.19044.1415
Search vendor "Microsoft" for product "Windows 10 21h2" and version " < 10.0.19044.1415"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 10 22h2
Search vendor "Microsoft" for product "Windows 10 22h2"
< 10.0.19045.2251
Search vendor "Microsoft" for product "Windows 10 22h2" and version " < 10.0.19045.2251"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 11 21h2
Search vendor "Microsoft" for product "Windows 11 21h2"
< 10.0.22000.318
Search vendor "Microsoft" for product "Windows 11 21h2" and version " < 10.0.22000.318"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 11 22h2
Search vendor "Microsoft" for product "Windows 11 22h2"
< 10.0.22621.674
Search vendor "Microsoft" for product "Windows 11 22h2" and version " < 10.0.22621.674"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows 7
Search vendor "Microsoft" for product "Windows 7"
-sp1
Affected
Microsoft
Search vendor "Microsoft"
Windows 8.1
Search vendor "Microsoft" for product "Windows 8.1"
--
Affected
Microsoft
Search vendor "Microsoft"
Windows Rt 8.1
Search vendor "Microsoft" for product "Windows Rt 8.1"
--
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 2008
Search vendor "Microsoft" for product "Windows Server 2008"
-sp2
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 2008
Search vendor "Microsoft" for product "Windows Server 2008"
r2
Search vendor "Microsoft" for product "Windows Server 2008" and version "r2"
sp1, x64
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 2012
Search vendor "Microsoft" for product "Windows Server 2012"
--
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 2012
Search vendor "Microsoft" for product "Windows Server 2012"
r2
Search vendor "Microsoft" for product "Windows Server 2012" and version "r2"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 2016
Search vendor "Microsoft" for product "Windows Server 2016"
< 10.0.14393.4470
Search vendor "Microsoft" for product "Windows Server 2016" and version " < 10.0.14393.4470"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 2019
Search vendor "Microsoft" for product "Windows Server 2019"
< 10.0.17763.2029
Search vendor "Microsoft" for product "Windows Server 2019" and version " < 10.0.17763.2029"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 2022
Search vendor "Microsoft" for product "Windows Server 2022"
< 10.0.20348.230
Search vendor "Microsoft" for product "Windows Server 2022" and version " < 10.0.20348.230"
-
Affected
Microsoft
Search vendor "Microsoft"
Windows Server 20h2
Search vendor "Microsoft" for product "Windows Server 20h2"
< 10.0.19042.1083
Search vendor "Microsoft" for product "Windows Server 20h2" and version " < 10.0.19042.1083"
-
Affected