CVE-2018-8589
Published: May 23, 2022
Official Description
A privilege escalation vulnerability exists when Windows improperly handles calls to Win32k.sys. An attacker who successfully exploited this vulnerability could run remote code in the security context of the local system.
CISA KEV Advisory
Microsoft Win32k Privilege Escalation Vulnerability
A privilege escalation vulnerability exists when Windows improperly handles calls to Win32k.sys. An attacker who successfully exploited this vulnerability could run remote code in the security context of the local system.
Apply updates per vendor instructions.
Risk Analysis
A privilege escalation vulnerability exists in Windows when Win32k.sys improperly handles calls, allowing an attacker to run code with local system privileges. The high EPSS score of 0.46257 and its inclusion in CISA's KEV indicate that this vulnerability is actively exploited and poses a critical risk to Windows systems.
This vulnerability is actively exploited in the wild and is included in CISA's Known Exploited Vulnerabilities Catalog. Exploitation can lead to remote code execution in the context of the local system.
Apply the latest security updates from Microsoft to patch the Win32k.sys vulnerability. Ensure all Windows systems are kept current with security patches.
Technical Analysis
CVE-2018-8589 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-2018-8589 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.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2018-8589 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