HIGHCVSS 8.8Actively exploited · CISA KEV since 2021-11-03Vulnerability

CVE-2021-34527

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.

Properties

Euvd product
Windows 10 Version 1809, Windows 10 Version 1607, Windows 10 Version 22H2, Windows 10 Version 20H2, Windows 10 Version 1507, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2012 R2, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2019 (Server Core installation), Windows 11 version 21H2, Windows Server version 20H2, Windows Server 2012 R2 (Server Core installation), Windows Server 2008 R2 Service Pack 1, Windows 10 Version 21H2, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows 11 version 22H2, Windows Server 2016, Windows Server 2022, Windows 8.1, Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Vulnerability name
Microsoft Windows Print Spooler Remote Code Execution Vulnerability
First seen
2026-08-10T15:12:05+00:00
Cvss score
8.8
Epss score
0.99792
Last seen
2026-10-19T12:00:27+00:00
Due date
2022-05-03
Euvd assigner
microsoft
Retrieved at
2026-10-21T01:24:47+00:00
Exploited euvd since
2021-11-03T00:00:00+00:00
Src batch id
epss_history-20261020T103617Z-728ddd
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2021-11-03
Euvd base score version
3.1
Score
8.8
Fetched at
2026-10-20T10:36:20+00:00
Euvd vendor
Microsoft
Cvss vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
In Signal since
initial import (Sep 2026)
Euvd base score
8.8

Related Entities (20)

AFFECTS_PRODUCT (17)

→[Product]cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
→[Product]cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*
→[Product]cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*

DESCRIBES (1)

←[KEVEntry]Microsoft Windows Print Spooler Remote Code Execution Vulnerability

INVOLVES (1)

←[Signal]kev_added · 2021-11-03

MENTIONED_IN (1)

→[Campaign]Operation STANDOFF: A Campaign Hiding C2 Behind GitHub Redirects

Explore deeper with Ninja Signal's threat intelligence graph

Search in SpektrOpen Signal Desktop
CVE-2021-34527 (CVSS 8.8) — Ninja Signal Threat Intelligence | Ninja Signal