CVE-2021-34527

Scores

EPSS

0.942high94.2%
0%20%40%60%80%100%

Percentile: 94.2%

CVSS

8.8high3.x
0246810

CVSS Score: 8.8/10

All CVSS Scores

CVSS 3.x
8.8

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

CVSS 2.0
9.0

Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C

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.

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Sources

msrcnvd

Related Vulnerabilities

Exploits

Exploit ID: CVE-2021-34527

Source: cisa

URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Vulnerable Software (258)

Type: Configuration

Vendor: *

Product: windows_10_1507

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_10_1607

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_10_1809

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_10_20h2

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_10_21h2

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_10_22h2

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_11_21h2

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_11_22h2

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_7

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_8.1

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_rt_8.1

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_server_2008

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_server_2012

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_server_2016

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_server_2019

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_server_2022

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Configuration

Vendor: *

Product: windows_server_20h2

Operating System: * * *

Trait:
{  "cpe_match": [    {      "cpe23uri": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*",      "versionEndExcluding": "10.0.10240.18969",      "vulnerable": true    },    {      "cpe23uri...

Source: nvd

Type: Windows KB

Vendor: Microsoft

Product: Windows

Version: 22621.1635

Operating System: Windows 22621 build 1635

Identifier: KB5025305

Source: msrc

Type: Windows KB

Vendor: Microsoft

Product: Windows

Version: 10.0.22621.5189

Operating System: Windows 22621 build 5189

Identifier: KB5055528

Source: msrc

Type: Windows KB

Vendor: Microsoft

Product: Windows

Version: 22621.3085

Operating System: Windows 22621 build 3085

Identifier: KB5034204

Source: msrc