KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2021-1675

Windows Print Spooler Remote Code Execution Vulnerability

Microsoft / Windows 10 Version 1809 · affected before 10.0.17763.1999

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Severity
CVSS 7.8 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
84.8%
First observed
—
Last observed
—

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

Windows Print Spooler Remote Code Execution Vulnerability

Vendor Product Affected Status
Microsoft Windows Server 2012 R2 Before 6.3.9600.20044 Affected
Microsoft Windows Server 2012 R2 (Server Core installation) Before 6.3.9600.20045 Affected
Microsoft Windows Server 2012 R2 (Server Core installation) Before 6.3.9600.20044 Affected
View vendor advisory (opens in new tab)
Published
08 Jun 2021
Exploitation Reported
03 Nov 2021
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required

Tags

microsoft cisa malware windows ransomware metasploit

CVE References

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.

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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.

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

  1. KEV confirmed by CVE

    Exploitation attested by an external source

  2. Metasploit module available

    Exploit module available

  3. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  4. First public exploitation report

    Exploit observed in malware

  5. Public PoC available

    Public proof-of-concept code published

  6. CVE published

    Vulnerability disclosed publicly

  7. 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.

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  • 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 }
}

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