CVEs / CVE-2023-21674
CVE-2023-21674: Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability
- Known exploited in the CISA KEV catalog since 10 Jan 2023
- high 8.8 CVSS 3.1 (from the CNA)
- EPSS 34.2% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.
Description
Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1809 | from 10.0.17763.0, before 10.0.17763.3887 | 10.0.17763.3887 |
| Microsoft Windows 10 Version 1809 | from 10.0.0, before 10.0.17763.3887 | 10.0.17763.3887 |
| Microsoft Windows Server 2019 | from 10.0.17763.0, before 10.0.17763.3887 | 10.0.17763.3887 |
| Microsoft Windows Server 2019 (Server Core installation) | from 10.0.17763.0, before 10.0.17763.3887 | 10.0.17763.3887 |
| Microsoft Windows Server 2022 | from 10.0.20348.0, before 10.0.20348.1487 | 10.0.20348.1487 |
| Microsoft Windows 10 Version 20H2 | from 10.0.0, before 10.0.19042.2486 | 10.0.19042.2486 |
| Microsoft Windows 11 version 21H2 | from 10.0.0, before 10.0.22000.1455 | 10.0.22000.1455 |
| Microsoft Windows 10 Version 21H2 | from 10.0.19043.0, before 10.0.19044.2486 | 10.0.19044.2486 |
| Microsoft Windows 11 version 22H2 | from 10.0.22621.0, before 10.0.22621.1105 | 10.0.22621.1105 |
| Microsoft Windows 10 Version 22H2 | from 10.0.19045.0, before 10.0.19045.2486 | 10.0.19045.2486 |
| Microsoft Windows 10 Version 1507 | from 10.0.10240.0, before 10.0.10240.19685 | 10.0.10240.19685 |
| Microsoft Windows 10 Version 1607 | from 10.0.14393.0, before 10.0.14393.5648 | 10.0.14393.5648 |
| Microsoft Windows Server 2016 | from 10.0.14393.0, before 10.0.14393.5648 | 10.0.14393.5648 |
| Microsoft Windows Server 2016 (Server Core installation) | from 10.0.14393.0, before 10.0.14393.5648 | 10.0.14393.5648 |
| Microsoft Windows 8.1 | from 6.3.0, before 6.3.9600.20778 | 6.3.9600.20778 |
| Microsoft Windows Server 2012 R2 | from 6.3.9600.0, before 6.3.9600.20778 | 6.3.9600.20778 |
| Microsoft Windows Server 2012 R2 (Server Core installation) | from 6.3.9600.0, before 6.3.9600.20778 | 6.3.9600.20778 |
Exploitation
| In CISA KEV since | 10 Jan 2023 |
|---|---|
| Due date for US federal agencies | 31 Jan 2023 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 8.8 highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-416 |
References
- CVE-2023-21674 on NVD
- CVE-2023-21674 in the CISA KEV catalog
- https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-21674 (cited by CISA)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21674 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
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