High 8.8Known exploited (CISA KEV)Published Jan 9, 2023

CVE-2023-21674Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

Updated under an hour ago (Oct 27, 2026, 4:30 PM ET)

Does this affect you?

It affects Microsoft Windows 10 Version 1809 and 14 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Jan 10, 2023; federal agencies had to remediate by Jan 31, 2023. Treat that date as your deadline.

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Every CVE for Microsoft Windows 10 Version 1809

Exploited in the last 30 days

Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

CVSS: 8.8 HIGH (v3.1, CNA)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
Weakness (CWE): CWE-416
Known exploited: Added to CISA KEV Jan 10, 2023; federal remediation due Jan 31, 2023Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 34.21% (percentile 98)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Windows 10 Version 1809 microsoft:windows_10_1809	from 10.0.17763.0 before 10.0.17763.3887	CNA record
Microsoft Windows Server 2019 microsoft:windows_server_2019 (from the name)	from 10.0.17763.0 before 10.0.17763.3887	CNA record
Microsoft Windows Server 2022 microsoft:windows_server_2022 (from the name)	from 10.0.20348.0 before 10.0.20348.1487	CNA record
Microsoft Windows 10 Version 20H2 microsoft:windows_10_20h2	from 10.0.0 before 10.0.19042.2486	CNA record
Microsoft Windows 11 version 21H2 microsoft:windows_11_21h2	from 10.0.0 before 10.0.22000.1455	CNA record
Microsoft Windows 10 Version 21H2 microsoft:windows_10_21h2	from 10.0.19043.0 before 10.0.19044.2486	CNA record
Microsoft Windows 11 version 22H2 microsoft:windows_11_22h2	from 10.0.22621.0 before 10.0.22621.1105	CNA record
Microsoft Windows 10 Version 22H2 microsoft:windows_10_22h2	from 10.0.19045.0 before 10.0.19045.2486	CNA record
Microsoft Windows 10 Version 1507 microsoft:windows_10_1507	from 10.0.10240.0 before 10.0.10240.19685	CNA record
Microsoft Windows 10 Version 1607 microsoft:windows_10_1607	from 10.0.14393.0 before 10.0.14393.5648	CNA record
1–10 of 26

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674	vendor-advisory, patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21674	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.