CVE intelligence and bounded remediation

CVE-2023-21674 — Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability

High CVSS 8.8 CISA KEV

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

Severity
High
CVSS
8.8 (3.1)
Published
2023-01-10
CISA KEV
Known exploited
Ecosystem
windows/system
Weaknesses
CWE-416

Affected products

  • microsoft / windows_10_1507
  • microsoft / windows_10_1607
  • microsoft / windows_10_1809
  • microsoft / windows_10_20h2
  • microsoft / windows_10_21h2
  • microsoft / windows_10_22h2

Showing 6 representative product identities from 13 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Use-after-free, double free, and expired resource use

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace ownership, references, callbacks, asynchronous tasks, and teardown paths around the affected object or resource.
  • Identify reachable inputs and timing or state transitions that can release the object while references remain.
  • Confirm affected builds, allocators, feature flags, architectures, and process privileges.

Remediate safely

  • Apply the maintained ownership or lifetime fix and rebuild all artifacts containing the affected native code.
  • Use explicit ownership, safe reference management, cancellation and join semantics, and idempotent teardown.
  • Add deterministic lifetime tests plus isolated sanitizer and concurrency coverage for shutdown and error paths.

Authoritative sources

Complete CVE record and remediation plan

The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.