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HomeCVEsCVE-2021-34527

CVE-2021-34527

Published: January 26, 2026
Last updated:1 day ago (January 26, 2026)
Exploit: YesZero-day: YesPatch: YesTrend: Viral
TL;DR
Updated January 26, 2026

CVE-2021-34527 is a high severity vulnerability with a CVSS score of 8.8. Exploits are available; patches have been released and should be applied urgently. This is classified as a zero-day vulnerability.

Key Points
  • 1High severity (CVSS 8.8/10)
  • 2EPSS: 94.00% - very high likelihood of exploitation
  • 3Public exploits are available
  • 4Vendor patches are available
  • 5Strobes Priority Score: 999/1000 (Critical)
  • 6Affects products from: Microsoft
Severity Scores
CVSS v38.8
CVSS v29.0
Priority Score999.0
EPSS Score94.0
High
Exploitation LikelihoodCritical
94.00%EPSS

Very high probability of exploitation in the next 30 days

Immediate patching required
94.00%
EPSS
8.8
CVSS
Yes
Exploit
Yes
Patch
Critical Priority
high EPSS • exploit exists • high priority

EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.

Description

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.

CVSS v3 Breakdown
Attack Vector:Network
Attack Complexity:Local
Privileges Required:Local
User Interaction:Network
Scope:Unchanged
Confidentiality:High
Integrity:High
Availability:High
Exploit References
Cisa.govPacketstormsecurity.comMetasploitGitHubGitHubGitHubGitHubGitHubGitHubGitHub
Patch References
[email protected]Zeroday CZ
Trend Analysis
Viral
Vulnerable Products
VendorProduct
MicrosoftWindows 7
MicrosoftWindows 10 1809
MicrosoftWindows Server 2016
MicrosoftWindows 10 22h2
MicrosoftWindows Rt 8.1
MicrosoftWindows 10 1607
MicrosoftWindows Server 2008
MicrosoftWindows Server 2022
MicrosoftWindows Server 2019
MicrosoftWindows 8.1

And 7 more...

Advisories
CISA: 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.
GitHub AdvisoryNVD
Cite This Page
APA Format
Strobes VI. (2026). CVE-2021-34527 - CVE Details and Analysis. Strobes VI. Retrieved January 27, 2026, from https://vi.strobes.co/cve/CVE-2021-34527
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