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CVE-2023-21674

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

HIGH
8.8
CVSS Score
Published: January 10, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 05:33 AM UTC
14 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012

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Severity
HIGH8.8
Exploitation
CISA KEV
Exploit prediction
EPSS 34%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score34.2%

EPSS (Exploit Prediction Scoring System) estimates a 34.2% chance this CVE is exploited in the wild within the next 30 days — higher than 98% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Unknown
Added to KEV
Jan 10, 2023
Remediation Due
Jan 31, 2023
1368 days overdue
Notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-21674
https://nvd.nist.gov/vuln/detail/CVE-2023-21674

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 1507· Microsoft
95%
v < 10.0.10240.1968510.0.10240.0 ≤ v < 10.0.10240.1968510.0.10240.0
Affected range stops below 10.0.10240.19685, so it looks safe — our inference, not a vendor statement
Windows 10 1607· Microsoft
95%
v < 10.0.14393.564810.0.14393.0 ≤ v < 10.0.14393.564810.0.14393.0
Affected range stops below 10.0.14393.5648, so it looks safe — our inference, not a vendor statement
Windows 10 1809· Microsoft
95%
v < 10.0.17763.388710.0.0 ≤ v < 10.0.17763.388710.0.17763.0 ≤ v < 10.0.17763.388710.0.010.0.17763.0
Affected range stops below 10.0.17763.3887, so it looks safe — our inference, not a vendor statement
Windows 10 20H2· Microsoft
95%
v < 10.0.19042.248610.0.0 ≤ v < 10.0.19042.248610.0.0
Affected range stops below 10.0.19042.2486, so it looks safe — our inference, not a vendor statement
Windows 10 21H2· Microsoft
95%
v < 10.0.19044.248610.0.19043.0 ≤ v < 10.0.19044.248610.0.19043.0
Affected range stops below 10.0.19044.2486, so it looks safe — our inference, not a vendor statement
Windows 10 22H2· Microsoft
95%
v < 10.0.19045.248610.0.19045.0 ≤ v < 10.0.19045.248610.0.19045.0
Affected range stops below 10.0.19045.2486, so it looks safe — our inference, not a vendor statement
Windows 11 21H2· Microsoft
95%
v < 10.0.22000.145510.0.0 ≤ v < 10.0.22000.145510.0.0
Affected range stops below 10.0.22000.1455, so it looks safe — our inference, not a vendor statement
Windows 11 22H2· Microsoft
95%
v < 10.0.22621.110510.0.22621.0 ≤ v < 10.0.22621.110510.0.22621.0
Affected range stops below 10.0.22621.1105, so it looks safe — our inference, not a vendor statement
Windows 8-1· Microsoft
95%
6.3.0 ≤ v < 6.3.9600.207786.3.0
Affected range stops below 6.3.9600.20778, so it looks safe — our inference, not a vendor statement
Windows Rt 8-1· Microsoft
95%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21674
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21674

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-416

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