--- title: "Critical Vuln.: PrintNightmare Exposes Windows Servers to RCE" url: https://daily.dev/posts/critical-vuln-printnightmare-exposes-windows-servers-to-rce-qncffeu5y source_url: https://www.huntress.com/blog/critical-vulnerability-printnightmare-exposes-windows-servers-to-remote-code-execution type: article source: "Huntress Blog" published: 2026-05-31T07:43:46.399Z updated: 2026-05-31T08:09:49.844Z tags: ["security", "microsoft"] reading_time: 9 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Critical Vuln.: PrintNightmare Exposes Windows Servers to RCE **[Huntress Blog](https://daily.dev/sources/huntress-blog)** · 9 min read · 0 upvotes · 0 comments ## Summary PrintNightmare (CVE-2021-34527) is a critical vulnerability in the Windows Print Spooler service enabling both remote code execution and local privilege escalation. The June 8 Microsoft patch did not fully resolve the issue. Temporary mitigations include disabling the Print Spooler service via PowerShell or Group Policy, or restricting ACLs on the spool drivers directory to prevent malicious DLL drops. Detection can be achieved by enabling Microsoft-Windows-PrintService/Operational logging and monitoring for Event ID 316 or ImageLoad events tied to spoolsv.exe. Public PoCs exist in Python and C++ and have been confirmed to work against Windows Server 2016 and 2019. An emergency patch was released July 6 but remains under scrutiny, as privilege escalation still succeeds on some Windows Server versions. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Critical Windows Netlogon RCE flaw now exploited in attacks](https://daily.dev/posts/critical-windows-netlogon-rce-flaw-now-exploited-in-attacks-zyueyb492) · BleepingComputer · 0 upvotes · 0 comments - [Critical Netlogon RCE Flaw Actively Exploited Against Windows Domain Controllers](https://daily.dev/posts/critical-netlogon-rce-flaw-actively-exploited-against-windows-domain-controllers-nrltrsik8) · Orca Security Blog · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#microsoft](https://daily.dev/tags/microsoft) [View this post on daily.dev](https://daily.dev/posts/critical-vuln-printnightmare-exposes-windows-servers-to-rce-qncffeu5y)