Exploitation evidence
Known exploited · CISA KEV listed
Added 2021-11-03. Ransomware campaign use: Known.
CISA required action: Apply updates per vendor instructions.
CISA due date: 2021-11-17. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Microsoft / Windows 10 Version 1809
Default status: Not specified
- affected: 10.0.0 to < 10.0.17763.1999 (custom)
Microsoft / Windows Server 2019
Default status: Not specified
- affected: 10.0.0 to < 10.0.17763.1999 (custom)
Microsoft / Windows Server 2019 (Server Core installation)
Default status: Not specified
- affected: 10.0.0 to < 10.0.17763.1999 (custom)
Microsoft / Windows 10 Version 1909
Default status: Not specified
- affected: 10.0.0 to < 10.0.18363.1621 (custom)
Microsoft / Windows 10 Version 21H1
Default status: Not specified
- affected: 10.0.0 to < 10.0.19043.1052 (custom)
Microsoft / Windows 10 Version 2004
Default status: Not specified
- affected: 10.0.0 to < 10.0.19041.1052 (custom)
Microsoft / Windows Server version 2004
Default status: Not specified
- affected: 10.0.0 to < 10.0.19041.1052 (custom)
Microsoft / Windows 10 Version 20H2
Default status: Not specified
- affected: 10.0.0 to < 10.0.19042.1052 (custom)
Microsoft / Windows Server version 20H2
Default status: Not specified
- affected: 10.0.0 to < 10.0.19042.1052 (custom)
Microsoft / Windows 10 Version 1507
Default status: Not specified
- affected: 10.0.0 to < 10.0.10240.18967 (custom)
Microsoft / Windows 10 Version 1607
Default status: Not specified
- affected: 10.0.0 to < 10.0.14393.4467 (custom)
Microsoft / Windows Server 2016
Default status: Not specified
- affected: 10.0.0 to < 10.0.14393.4467 (custom)
Microsoft / Windows Server 2016 (Server Core installation)
Default status: Not specified
- affected: 10.0.0 to < 10.0.14393.4467 (custom)
Microsoft / Windows 7
Default status: Not specified
- affected: 6.1.0 to < 6.1.7601.25632 (custom)
Microsoft / Windows 7 Service Pack 1
Default status: Not specified
- affected: 6.1.0 to < 6.1.7601.25632 (custom)
Microsoft / Windows 8.1
Default status: Not specified
- affected: 6.3.0 to < 6.3.9600.20045 (custom)
- affected: 6.3.0 to < 6.3.9600.20044 (custom)
Microsoft / Windows Server 2008 Service Pack 2
Default status: Not specified
- affected: 6.0.0 to < 6.0.6003.21137 (custom)
Microsoft / Windows Server 2008 Service Pack 2 (Server Core installation)
Default status: Not specified
- affected: 6.0.0 to < 6.0.6003.21137 (custom)
Microsoft / Windows Server 2008 Service Pack 2
Default status: Not specified
- affected: 6.0.0 to < 6.0.6003.21137 (custom)
Microsoft / Windows Server 2008 R2 Service Pack 1
Default status: Not specified
- affected: 6.1.0 to < 6.1.7601.25632 (custom)
Microsoft / Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Default status: Not specified
- affected: 6.0.0 to < 6.1.7601.25632 (custom)
Microsoft / Windows Server 2012
Default status: Not specified
- affected: 6.2.0 to < 6.2.9200.23372 (custom)
Microsoft / Windows Server 2012 (Server Core installation)
Default status: Not specified
- affected: 6.2.0 to < 6.2.9200.23372 (custom)
Microsoft / Windows Server 2012 R2
Default status: Not specified
- affected: 6.3.0 to < 6.3.9600.20045 (custom)
- affected: 6.3.0 to < 6.3.9600.20044 (custom)
Microsoft / Windows Server 2012 R2 (Server Core installation)
Default status: Not specified
- affected: 6.3.0 to < 6.3.9600.20045 (custom)
- affected: 6.3.0 to < 6.3.9600.20044 (custom)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1675
- https://www.kb.cert.org/vuls/id/383432
- http://packetstormsecurity.com/files/163349/Microsoft-PrintNightmare-Proof-Of-Concept.html
- http://packetstormsecurity.com/files/163351/PrintNightmare-Windows-Spooler-Service-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1675
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.85305,
"percentile": 0.99721
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.85305,
"percentile": 0.99719
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.85305,
"percentile": 0.99719
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.85305,
"percentile": 0.99719
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.85305,
"percentile": 0.99718
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.85305,
"percentile": 0.99718
}06 Nov 2026, 00:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-1675",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2021-06-29T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1675"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-noinfo Not enough information",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-12T03:55:44.254Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1675"
}
],
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-03T16:18:11.042Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
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],
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1675"
},
{
"name": "VU#383432",
"tags": [
"third-party-advisory",
"x_refsource_CERT-VN",
"x_transferred"
],
"url": "https://www.kb.cert.org/vuls/id/383432"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "http://packetstormsecurity.com/files/163349/Microsoft-PrintNightmare-Proof-Of-Concept.html"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "http://packetstormsecurity.com/files/163351/PrintNightmare-Windows-Spooler-Service-Remote-Code-Execution.html"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.1999:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.1999:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.1999:*:*:*:*:*:arm64:*"
],
"platforms": [
"32-bit Systems",
"x64-based Systems",
"ARM64-based Systems"
],
"product": "Windows 10 Version 1809",
"vendor": "Microsoft",
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{
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"version": "10.0.0",
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{
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"platforms": [
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"product": "Windows Server 2019",
"vendor": "Microsoft",
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{
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"platforms": [
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],
"product": "Windows Server 2019 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1621:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1621:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1621:*:*:*:*:*:x64:*"
],
"platforms": [
"32-bit Systems",
"x64-based Systems",
"ARM64-based Systems"
],
"product": "Windows 10 Version 1909",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.18363.1621",
"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:arm64:*",
"cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:x86:*"
],
"platforms": [
"x64-based Systems",
"ARM64-based Systems",
"32-bit Systems"
],
"product": "Windows 10 Version 21H1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.19043.1052",
"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1052:*:*:*:*:*:x64:*"
],
"platforms": [
"32-bit Systems",
"ARM64-based Systems",
"x64-based Systems"
],
"product": "Windows 10 Version 2004",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.19041.1052",
"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1052:*:*:*:*:*:*:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server version 2004",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.19041.1052",
"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052:*:*:*:*:*:arm64:*"
],
"platforms": [
"32-bit Systems",
"ARM64-based Systems"
],
"product": "Windows 10 Version 20H2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.19042.1052",
"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1052:*:*:*:*:*:*:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server version 20H2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.19042.1052",
"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.18967:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.18967:*:*:*:*:*:x64:*"
],
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Windows 10 Version 1507",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4467:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4467:*:*:*:*:*:x64:*"
],
"platforms": [
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"x64-based Systems"
],
"product": "Windows 10 Version 1607",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "10.0.0",
"versionType": "custom"
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]
},
{
"cpes": [
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"platforms": [
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"product": "Windows Server 2016",
"vendor": "Microsoft",
"versions": [
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"status": "affected",
"version": "10.0.0",
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]
},
{
"cpes": [
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"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2016 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "10.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_7:6.1.7601.25632:sp1:*:*:*:*:x86:*"
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"platforms": [
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],
"product": "Windows 7",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "6.1.0",
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]
},
{
"cpes": [
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"platforms": [
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],
"product": "Windows 7 Service Pack 1",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "6.1.0",
"versionType": "custom"
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]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20045:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20044:*:*:*:*:*:x86:*",
"cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20045:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20044:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20045:*:*:*:*:*:*:*"
],
"platforms": [
"32-bit Systems",
"x64-based Systems",
"ARM64-based Systems"
],
"product": "Windows 8.1",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.3.9600.20045",
"status": "affected",
"version": "6.3.0",
"versionType": "custom"
},
{
"lessThan": "6.3.9600.20044",
"status": "affected",
"version": "6.3.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21137:*:*:*:*:*:x64:*"
],
"platforms": [
"32-bit Systems"
],
"product": "Windows Server 2008 Service Pack 2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.0.6003.21137",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21137:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21137:*:*:*:*:*:x86:*"
],
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"product": "Windows Server 2008 Service Pack 2 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.0.6003.21137",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21137:*:*:*:*:*:x86:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2008 Service Pack 2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.0.6003.21137",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
},
{
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"cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25632:*:*:*:*:*:x64:*"
],
"platforms": [
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],
"product": "Windows Server 2008 R2 Service Pack 1",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "6.1.0",
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}
]
},
{
"cpes": [
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"platforms": [
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],
"product": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.1.7601.25632",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23372:*:*:*:*:*:x64:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2012",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.2.9200.23372",
"status": "affected",
"version": "6.2.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23372:*:*:*:*:*:x64:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2012 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.2.9200.23372",
"status": "affected",
"version": "6.2.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20045:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20044:*:*:*:*:*:x64:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2012 R2",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.3.9600.20045",
"status": "affected",
"version": "6.3.0",
"versionType": "custom"
},
{
"lessThan": "6.3.9600.20044",
"status": "affected",
"version": "6.3.0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20045:*:*:*:*:*:x64:*",
"cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20044:*:*:*:*:*:x64:*"
],
"platforms": [
"x64-based Systems"
],
"product": "Windows Server 2012 R2 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.3.9600.20045",
"status": "affected",
"version": "6.3.0",
"versionType": "custom"
},
{
"lessThan": "6.3.9600.20044",
"status": "affected",
"version": "6.3.0",
"versionType": "custom"
}
]
}
],
"datePublic": "2021-06-08T07:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Windows Print Spooler Remote Code Execution Vulnerability"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Elevation of Privilege",
"lang": "en-US",
"type": "Impact"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-05-29T14:55:40.040Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1675"
},
{
"name": "VU#383432",
"tags": [
"third-party-advisory",
"x_refsource_CERT-VN"
],
"url": "https://www.kb.cert.org/vuls/id/383432"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "http://packetstormsecurity.com/files/163349/Microsoft-PrintNightmare-Proof-Of-Concept.html"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "http://packetstormsecurity.com/files/163351/PrintNightmare-Windows-Spooler-Service-Remote-Code-Execution.html"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "http://packetstormsecurity.com/files/167261/Print-Spooler-Remote-DLL-Injection.html"
}
],
"title": "Windows Print Spooler Remote Code Execution Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2021-1675",
"datePublished": "2021-06-08T22:46:11.000Z",
"dateReserved": "2020-12-02T00:00:00.000Z",
"dateUpdated": "2026-08-12T03:55:44.254Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}05 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.85305,
"percentile": 0.99718
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.85305,
"percentile": 0.99717
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.85305,
"percentile": 0.99717
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.85305,
"percentile": 0.99716
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2021-1675",
"cwes": [
"CWE-285"
],
"dateAdded": "2021-11-03",
"dueDate": "2021-11-17",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-1675",
"product": "Windows",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "Microsoft Windows Print Spooler contains an unspecified vulnerability that allows for remote code execution.",
"vendorProject": "Microsoft",
"vulnerabilityName": "Microsoft Windows Print Spooler Remote Code Execution Vulnerability"
}