CVE-2023-21674
Published: January 10, 2023
Official Description
Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.
CISA KEV Advisory
Microsoft Windows Advanced Local Procedure Call (ALPC) Privilege Escalation Vulnerability
Microsoft Windows Advanced Local Procedure Call (ALPC) contains an unspecified vulnerability that allows for privilege escalation.
Apply updates per vendor instructions.
Risk Analysis
This high-severity vulnerability in Microsoft Windows Advanced Local Procedure Call (ALPC) allows for privilege escalation. The high EPSS score of 0.12429 indicates a significant likelihood of exploitation, making this an urgent concern for Windows administrators.
This vulnerability is actively being exploited in the wild and is listed in CISA's KEV catalog, confirming its active use by threat actors.
Administrators should apply the latest security updates for Microsoft Windows to address this ALPC privilege escalation flaw.
Technical Analysis
CVE-2023-21674 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2023-21674 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-21674 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1