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Fencer Vulns
high 8.8

CVE-2023-21674 kev in the critical feed json

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

published 2023-01-10 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-25841

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2023-01-10
epss
34.2%
EPSS 34.2% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

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

Patch / fix

cisa required action Apply updates per vendor instructions.

  • Microsoft Windows 10 Version 1809 10.0.17763.3887
  • Microsoft Windows Server 2019 10.0.17763.3887
  • Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.3887
  • Microsoft Windows Server 2022 10.0.20348.1487
  • Microsoft Windows 10 Version 20H2 10.0.19042.2486
  • Microsoft Windows 11 version 21H2 10.0.22000.1455
  • Microsoft Windows 10 Version 21H2 10.0.19044.2486
  • Microsoft Windows 11 version 22H2 10.0.22621.1105
  • Microsoft Windows 10 Version 22H2 10.0.19045.2486
  • Microsoft Windows 10 Version 1507 10.0.10240.19685
  • Microsoft Windows 10 Version 1607 10.0.14393.5648
  • Microsoft Windows Server 2016 10.0.14393.5648
  • Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.5648
  • Microsoft Windows 8.1 6.3.9600.20778
  • Microsoft Windows Server 2012 R2 6.3.9600.20778
  • Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.20778

Timeline

  1. Published
  2. 0-day patched (Project Zero)
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
3 y ago
Patch by
2023-01-31 (3 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Microsoft, Windows
CISA name
Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched
2023-01-10
Details
project zero tracker

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1078 Valid Accounts exploitation
  • T1068 Exploitation for Privilege Escalation primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

34.21% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 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
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Microsoft Windows 10 Version 1809
  • Microsoft Windows Server 2019
  • Microsoft Windows Server 2019 (Server Core installation)
  • Microsoft Windows Server 2022
  • Microsoft Windows 10 Version 20H2
  • Microsoft Windows 11 version 21H2
  • Microsoft Windows 10 Version 21H2
  • Microsoft Windows 11 version 22H2
  • Microsoft Windows 10 Version 22H2
  • Microsoft Windows 10 Version 1507
  • Microsoft Windows 10 Version 1607
  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2016 (Server Core installation)
  • Microsoft Windows 8.1
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 R2 (Server Core installation)

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.