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Page generated: 09 Nov 2026, 08:04 UTC

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CVE-2021-1675

Windows Print Spooler Remote Code Execution Vulnerability

CVSS 7.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

8.6/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 7.8: +1.17
Fresh EPSS: 85.30%: +0.43

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 12 documents and public datasets.

Hype components

Headline sample (25%)

0/100

Press, 30 days (60%)

0/100

Grounded branding (15%)

0/100

HYPE TOTAL0/100

Sources and documents

SentinelOne

Press · 27 Apr 2025, 07:00 · PrintNightmare Vulnerability: Analysis and Mitigation - SentinelOne

Help Net Security

Press · 19 Jul 2021, 07:00 · There are new unpatched bugs in Windows Print Spooler - Help Net Security

Unit 42

Press · 14 Jul 2021, 07:00 · Threat Brief: Windows Print Spooler RCE Vulnerability (CVE-2021-34527 AKA PrintNightmare) - Unit 42

Rapid7

Press · 09 Jul 2021, 07:00 · Metasploit Wrap-Up: Jul. 9, 2021 - Rapid7

Kaspersky

Press · 08 Jul 2021, 07:00 · PrintNightmare (CVE-2021-34527) allows domain controller capture - Kaspersky

See all 12 source documents

Redmondmag.com

Press · 07 Jul 2021, 07:00 · Microsoft Issues Out-of-Band 'PrintNightmare' Windows Print Spooler Patch - Redmondmag.com

Cyberint

Press · 05 Jul 2021, 07:00 · PrintNightmare CVE-2021-34527 - Cyberint

Palo Alto Networks

Press · 02 Jul 2021, 07:00 · Remediating PrintNightmare (CVE-2021-1675) Using Cortex XSOAR - Palo Alto Networks

The Hacker News

Press · 02 Jul 2021, 07:00 · Microsoft Warns of Critical "PrintNightmare" Flaw Being Exploited in the Wild - The Hacker News

Forbes

Press · 02 Jul 2021, 07:00 · Critical PrintNightmare Security Warning For All Windows OS Versions - Forbes

Huntress

Press · 30 Jun 2021, 07:00 · Critical Vuln.: PrintNightmare Exposes Windows Servers to RCE - Huntress

Rapid7

Press · 30 Jun 2021, 07:00 · CVE-2021-34527 - PrintNightmare, What You Need to Know - Rapid7

Score evolution

● Hype ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.6 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

Public exploit entries / repo candidates

See 3 repos with metrics

Repository	Stars	Forks	Language	Updated
eversinc33/NimNightmare	18	5	Nim	05 Dec 2021, 14:51
OppressionBreedsResistance/CVE-2021-1675-PrintNightmare	1	3	PowerShell	06 Oct 2021, 21:04
HKenzoKimura/CVE-2021-1675	0	0	Python	06 Sep 2026, 23:36

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence: Exploitation recorded
Priority basis: Recorded exploitation; CVSS 7.8; EPSS 85.3%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: local access, no prior privileges, user interaction.
Observed activity: Exploitation recorded in CISA KEV.
Known scale: Not quantified.
Evidence confidence basis: Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:22.744333+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

Published

08 Jun 2021, 22:46

First press mention

30 Jun 2021, 07:00

Added to the CISA KEV catalog

03 Nov 2021, 00:00

Latest press mention

27 Apr 2025, 07:00

Score calculated

05 Nov 2026, 13:58

PoCs on GitHub

3 repositories