Security CISA KEV CVE-2021-34527 CVE-2021-34527 CISA KEV
Microsoft Windows Print Spooler Remote Code Execution Vulnerability
Severity unknown CVSS unknown Check the vendor advisory for fixed versions
CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.
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.
Product Windows
Added to KEV 3 Nov 2021
Federal remediation due 3 May 2022
Known ransomware use Yes
Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.
Cite this version Field-level log (2)
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23 Oct 2026 · 09:33:49 UTC
Source coverage: cisa-kev Incomplete → Current 23 Oct 2026 · 08:31:50 UTC
Source coverage: cisa-kev Current → Incomplete Explore global source statements, affected packages and advisory history for CVE-2021-34527 . The catalog has a separate collection scope from Microsoft release records.
More advisories, affected versions and source history
cve-program · CVE-2021-34527 Published Windows 10 Version 1507 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 10 Version 1507",
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.10240.0",
"lessThan": "10.0.10240.18969",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 1607 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 10 Version 1607",
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.14393.0",
"lessThan": "10.0.14393.4470",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 1809 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 10 Version 1809",
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.2029",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 1809 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 10 Version 1809",
"platforms": [
"ARM64-based Systems"
],
"versions": [
{
"version": "10.0.0",
"lessThan": "10.0.17763.2029",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 20H2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 10 Version 20H2",
"platforms": [
"32-bit Systems",
"ARM64-based Systems"
],
"versions": [
{
"version": "10.0.0",
"lessThan": "10.0.19042.1083",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 21H2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 10 Version 21H2",
"platforms": [
"32-bit Systems",
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.19044.0",
"lessThan": "10.0.19044.1415",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 22H2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 10 Version 22H2",
"platforms": [
"32-bit Systems",
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.19045.0",
"lessThan": "10.0.19045.2251",
"versionType": "custom",
"status": "affected"
}
]
} Windows 11 version 21H2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 11 version 21H2",
"platforms": [
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.22000.0",
"lessThan": "10.0.22000.318",
"versionType": "custom",
"status": "affected"
}
]
} Windows 11 version 22H2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 11 version 22H2",
"platforms": [
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.22621.0",
"lessThan": "10.0.22621.674",
"versionType": "custom",
"status": "affected"
}
]
} Windows 8.1 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows 8.1",
"platforms": [
"ARM64-based Systems"
],
"versions": [
{
"version": "6.3.0",
"lessThan": "6.3.9600.20046",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2008 R2 Service Pack 1 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2008 R2 Service Pack 1",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.1.7601.0",
"lessThan": "6.1.7601.25633",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2008 R2 Service Pack 1 (Server Core installation) Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.1.7601.0",
"lessThan": "6.1.7601.25633",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2008 Service Pack 2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2008 Service Pack 2",
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"versions": [
{
"version": "6.0.6003.0",
"lessThan": "6.0.6003.21138",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2008 Service Pack 2 (Server Core installation) Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2008 Service Pack 2 (Server Core installation)",
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"versions": [
{
"version": "6.0.6003.0",
"lessThan": "6.0.6003.21138",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2012 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2012",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.2.9200.0",
"lessThan": "6.2.9200.23383",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2012 (Server Core installation) Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2012 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.2.9200.0",
"lessThan": "6.2.9200.23383",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2012 R2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2012 R2",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.3.9600.0",
"lessThan": "6.3.9600.20046",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2012 R2 (Server Core installation) Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2012 R2 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "6.3.9600.0",
"lessThan": "6.3.9600.20046",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2016 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2016",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.14393.0",
"lessThan": "10.0.14393.4470",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2016 (Server Core installation) Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2016 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.14393.0",
"lessThan": "10.0.14393.4470",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2019 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2019",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.2029",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2019 (Server Core installation) Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2019 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.2029",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2022 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server 2022",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.20348.0",
"lessThan": "10.0.20348.230",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server version 20H2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "Microsoft",
"product": "Windows Server version 20H2",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.0",
"lessThan": "10.0.19042.1083",
"versionType": "custom",
"status": "affected"
}
]
} Original source record · Cite this exact observation · Complete original publisher JSON