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Critical Windows Print Spooler Vulnerability CVE-2021-34527 Exploited

ID: e82c0f97-6d7b-51ae-b7db-6aab224fa024

STIX ID: report--e82c0f97-6d7b-51ae-b7db-6aab224fa024

Feed Name: ThreatCluster

Threat Score
85/100

Date Published: 2026-06-17

Date Updated: 2026-06-23

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CVE-2021-34527 ("PrintNightmare") is a critical remote code execution vulnerability in the Windows Print Spooler (CVSSv3 8.8) that can allow authenticated users to execute arbitrary code on affected systems. Microsoft issued out-of-band updates, but the report states additional mitigations (e.g., disabling Point and Print) are required for full remediation; exploitation in the wild has been observed and attack tools like Mimikatz and Metasploit are available, raising the risk of follow-on ransomware campaigns.

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