CVE-2019-0797: Windows Win32k memory handling privilege escalation

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 17 September 2026. Confidence: high.

high priorityIt is a locally exploitable elevation of privilege flaw with confirmed exploitation in the wild per CISA KEV, though it requires local access and low privileges.

What it is

The Win32k component in Windows fails to properly handle objects in memory, allowing an elevation of privilege. A local attacker who can run code on a target can exploit this to gain higher privileges, which matters because it can turn limited access into full system control.

Impact

An attacker gains elevated privileges on the affected Windows host, potentially reaching SYSTEM-level access. This enables further actions such as disabling security controls, persisting, or moving laterally.

Attack surface

The vulnerability is local (CVSS vector AV:L) and requires low privileges (PR:L) with no user interaction (UI:N). It is reached by running crafted code on the target system, not over the network.

Exploitation

CVE-2019-0797 is listed in CISA's Known Exploited Vulnerabilities catalog, indicating exploitation in the wild. EPSS 30-day probability is about 1.9% (78.5th percentile), and no ransomware campaign use is documented.

What to do

• Apply the Microsoft security update referenced in the vendor advisory for all affected Windows versions.
• Restrict local logon and code execution rights to trusted users and administrators.
• Enable and monitor endpoint detection for privilege escalation behavior on Windows hosts.
• Keep Windows systems on supported builds and apply cumulative updates promptly.

Detection

• Monitor for processes spawning with SYSTEM or elevated tokens from unexpected parent processes.
• Alert on known Win32k exploitation patterns such as unusual win32k.sys interactions or token manipulation.
• Review Windows security event logs for suspicious privilege use (e.g., SeDebugPrivilege, token duplication) on affected hosts.
• Track CISA KEV status and verify patching through vulnerability management scans.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.