Is CVE-2021-1675 actively exploited?

Yes. KEV Intelligence tracks CVE-2021-1675 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2021-1675. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2021-1675 affects Microsoft Windows 10 Version 1809 and 24 other products. KEV Intelligence lists 28 version rows; examples include 10.0.0 to < 10.0.17763.1999.

Yes. CVE-2021-1675 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

CVE-2021-1675 Exploited in the Wild — Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2, Windows 10 Version 1507, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows 7, Windows 7 Service Pack 1, Windows 8.1, Windows Server 2008 Service Pack 2, Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)

Q: What is CVE-2021-1675?

CVE-2021-1675 is an unauthenticated Windows Print Spooler Remote Code Execution Vulnerability affecting Microsoft Windows 10 Version 1809 and 24 other products.

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2021-1675 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-1675 is an unauthenticated Windows Print Spooler Remote Code Execution Vulnerability affecting Microsoft Windows 10 Version 1809 and 24 other products.

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Windows 10 Version 1809 affected before 10.0.17763.1999.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Windows Print Spooler Remote Code Execution Vulnerability

Vendor Product Affected Status

Microsoft Windows 10 Version 1809 Before 10.0.17763.1999 Affected

Microsoft Windows Server 2019 Before 10.0.17763.1999 Affected

Microsoft Windows Server 2019 (Server Core installation) Before 10.0.17763.1999 Affected

Microsoft Windows 10 Version 1909 Before 10.0.18363.1621 Affected

Microsoft Windows 10 Version 21H1 Before 10.0.19043.1052 Affected

Microsoft Windows 10 Version 2004 Before 10.0.19041.1052 Affected

Microsoft Windows Server version 2004 Before 10.0.19041.1052 Affected

Microsoft Windows 10 Version 20H2 Before 10.0.19042.1052 Affected

Microsoft Windows Server version 20H2 Before 10.0.19042.1052 Affected

Microsoft Windows 10 Version 1507 Before 10.0.10240.18967 Affected

Microsoft Windows 10 Version 1607 Before 10.0.14393.4467 Affected

Microsoft Windows Server 2016 Before 10.0.14393.4467 Affected

Microsoft Windows Server 2016 (Server Core installation) Before 10.0.14393.4467 Affected

Microsoft Windows 7 Before 6.1.7601.25632 Affected

Microsoft Windows 7 Service Pack 1 Before 6.1.7601.25632 Affected

Microsoft Windows 8.1 Before 6.3.9600.20045 Affected

Microsoft Windows 8.1 Before 6.3.9600.20044 Affected

Microsoft Windows Server 2008 Service Pack 2 Before 6.0.6003.21137 Affected

Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) Before 6.0.6003.21137 Affected

Microsoft Windows Server 2008 Service Pack 2 Before 6.0.6003.21137 Affected

Microsoft Windows Server 2008 R2 Service Pack 1 Before 6.1.7601.25632 Affected

Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) Before 6.1.7601.25632 Affected

Microsoft Windows Server 2012 Before 6.2.9200.23372 Affected

Microsoft Windows Server 2012 (Server Core installation) Before 6.2.9200.23372 Affected

Microsoft Windows Server 2012 R2 Before 6.3.9600.20045 Affected

View vendor advisory

Published: 08 Jun 2021
Exploitation Reported: 03 Nov 2021
Attack vector: Local
Complexity: Low
Privileges: None
User interaction: Required

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2021-1675
VU#383432 kb.cert.org · Third-Party Advisory https://www.kb.cert.org/vuls/id/383432
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1675 portal.msrc.microsoft.com · CVE Record https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CV...
packetstormsecurity.com/files/163349/Microsoft-PrintNightmare-Proof-... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/163349/Microsoft-PrintNightmare-...
packetstormsecurity.com/files/163351/PrintNightmare-Windows-Spooler-... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/163351/PrintNightmare-Windows-Sp...
packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Inject... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-...

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 03 Nov 2021

Independent exploitation attestation added to the KEV Intelligence record.

Used in malware

CISA

Recorded 03 Nov 2021

Malware families have been linked to exploitation of this CVE.

Proof of concept available

GitHub

Recorded 29 Jun 2021

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
CISA First	2021-11-03 00:00 UTC
CVE	2026-08-12 04:21 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

Metasploit template detected 28 Apr 2025.

View Metasploit template

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/dcerpc/cve_2021_1675_printnightmare.rb	28 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.8 High

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

EPSS

84.8%

All CVSS Scores

CVSS v3.1 7.8 High

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

CVSS v2.0 9.3 High

AV:N/AC:M/Au:N/C:C/I:C/A:C

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

mstxq17/CVE-2021-1675_RDL_LPE

github · Created 2021-09-01 11:25:04 UTC · 148 stars · AI assessment 90%

PrintNightMare LPE提权漏洞的CS 反射加载插件。开箱即用、通过内存加载、混淆加载的驱动名称来ByPass Defender/EDR。

calebstewart/CVE-2021-1675

github · Created 2021-07-01 23:45:58 UTC · 1050 stars · AI assessment 90%

Pure PowerShell implementation of CVE-2021-1675 Print Spooler Local Privilege Escalation (PrintNightmare)

hlldz/CVE-2021-1675-LPE

github · Created 2021-07-01 09:47:13 UTC · 333 stars · AI assessment 90%

Local Privilege Escalation Edition for CVE-2021-1675/CVE-2021-34527

evilashz/CVE-2021-1675-LPE-EXP

github · Created 2021-07-01 09:00:31 UTC · 59 stars · AI assessment 90%

PrintNightmare , Local Privilege Escalation of CVE-2021-1675 or CVE-2021-34527

cube0x0/CVE-2021-1675

github · Created 2021-06-29 17:24:14 UTC · 1881 stars · AI assessment 90%

C# and Impacket implementation of PrintNightmare CVE-2021-1675/CVE-2021-34527

Timeline

From disclosure to observed exploitation

12 Aug 2026
KEV confirmed by CVE

Exploitation attested by an external source
28 Apr 2025
Metasploit module available

Exploit module available
03 Nov 2021
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
03 Nov 2021
First public exploitation report

Exploit observed in malware
29 Jun 2021
Public PoC available

Public proof-of-concept code published
08 Jun 2021
CVE published

Vulnerability disclosed publicly
02 Dec 2020
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

View Pro pricing Read API docs

Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-1675

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2021-1675",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.84814,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2021-1675

What security teams need to know first

Windows Print Spooler Remote Code Execution Vulnerability

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Used in malware

Proof of concept available

Known exploited vulnerability sources

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Scanner Artifacts

Severity, weaknesses, and research context

All CVSS Scores

Potential Proof of Concepts

From disclosure to observed exploitation

KEV confirmed by CVE

Metasploit module available

Added to CISA KEV

First public exploitation report

Public PoC available

CVE published

CVE ID reserved

Automate this intelligence

Get alerts on high-impact exploitation