Exploitation evidence
Known exploited · CISA KEV listed
Added 2023-01-10. Ransomware campaign use: Unknown.
CISA required action: Apply updates per vendor instructions.
CISA due date: 2023-01-31. 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: 10.0.17763.0 to < 10.0.17763.3887 (custom)
Microsoft / Windows 10 Version 1809
Default status: Not specified
- affected: 10.0.0 to < 10.0.17763.3887 (custom)
Microsoft / Windows Server 2019
Default status: Not specified
- affected: 10.0.17763.0 to < 10.0.17763.3887 (custom)
Microsoft / Windows Server 2019 (Server Core installation)
Default status: Not specified
- affected: 10.0.17763.0 to < 10.0.17763.3887 (custom)
Microsoft / Windows Server 2022
Default status: Not specified
- affected: 10.0.20348.0 to < 10.0.20348.1487 (custom)
Microsoft / Windows 10 Version 20H2
Default status: Not specified
- affected: 10.0.0 to < 10.0.19042.2486 (custom)
Microsoft / Windows 11 version 21H2
Default status: Not specified
- affected: 10.0.0 to < 10.0.22000.1455 (custom)
Microsoft / Windows 10 Version 21H2
Default status: Not specified
- affected: 10.0.19043.0 to < 10.0.19044.2486 (custom)
Microsoft / Windows 11 version 22H2
Default status: Not specified
- affected: 10.0.22621.0 to < 10.0.22621.1105 (custom)
Microsoft / Windows 10 Version 22H2
Default status: Not specified
- affected: 10.0.19045.0 to < 10.0.19045.2486 (custom)
Microsoft / Windows 10 Version 1507
Default status: Not specified
- affected: 10.0.10240.0 to < 10.0.10240.19685 (custom)
Microsoft / Windows 10 Version 1607
Default status: Not specified
- affected: 10.0.14393.0 to < 10.0.14393.5648 (custom)
Microsoft / Windows Server 2016
Default status: Not specified
- affected: 10.0.14393.0 to < 10.0.14393.5648 (custom)
Microsoft / Windows Server 2016 (Server Core installation)
Default status: Not specified
- affected: 10.0.14393.0 to < 10.0.14393.5648 (custom)
Microsoft / Windows 8.1
Default status: Not specified
- affected: 6.3.0 to < 6.3.9600.20778 (custom)
Microsoft / Windows Server 2012 R2
Default status: Not specified
- affected: 6.3.9600.0 to < 6.3.9600.20778 (custom)
Microsoft / Windows Server 2012 R2 (Server Core installation)
Default status: Not specified
- affected: 6.3.9600.0 to < 6.3.9600.20778 (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
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": 0.34206,
"percentile": 0.98428
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.34206,
"percentile": 0.98418
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.34206,
"percentile": 0.98416
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.34206,
"percentile": 0.98415
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.34206,
"percentile": 0.98414
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.34206,
"percentile": 0.98412
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.34206,
"percentile": 0.9841
}05 Nov 2026, 00:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2023-21674",
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"version": "2.0.3"
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"product": "Windows 10 Version 1507",
"vendor": "Microsoft",
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"product": "Windows 10 Version 1607",
"vendor": "Microsoft",
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"status": "affected",
"version": "10.0.14393.0",
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"product": "Windows Server 2016",
"vendor": "Microsoft",
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"status": "affected",
"version": "10.0.14393.0",
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},
{
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"product": "Windows Server 2016 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "10.0.14393.0",
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},
{
"platforms": [
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"x64-based Systems",
"ARM64-based Systems"
],
"product": "Windows 8.1",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "6.3.0",
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"version": "6.3.9600.0",
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]
},
{
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],
"product": "Windows Server 2012 R2 (Server Core installation)",
"vendor": "Microsoft",
"versions": [
{
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"status": "affected",
"version": "6.3.9600.0",
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"cpeApplicability": [
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],
"datePublic": "2023-01-10T08:00:00.000Z",
"descriptions": [
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],
"metrics": [
{
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C",
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],
"providerMetadata": {
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}
],
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},
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"datePublished": "2023-01-10T00:00:00.000Z",
"dateReserved": "2022-12-13T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:15:28.774Z",
"state": "PUBLISHED"
},
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}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.34206,
"percentile": 0.98409
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.34206,
"percentile": 0.98406
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.34206,
"percentile": 0.98404
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2023-21674",
"cwes": [
"CWE-416"
],
"dateAdded": "2023-01-10",
"dueDate": "2023-01-31",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-21674; https://nvd.nist.gov/vuln/detail/CVE-2023-21674",
"product": "Windows",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.",
"vendorProject": "Microsoft",
"vulnerabilityName": "Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability"
}