CVE-2019-0808: Microsoft 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: medium.

high priorityThe flaw is in CISA KEV with public exploit code and a very high EPSS score, but it requires a local low-privileged foothold rather than remote access.

What it is

The Win32k component in Windows fails to properly handle objects in memory, allowing an elevation of privilege. A local attacker who already has code execution on a host can use this to gain higher privileges, which matters because it turns a limited foothold into full system control. The record does not specify the exact affected builds beyond Windows 7 and Windows Server 2008.

Impact

An attacker gains elevated privileges on the affected system, with high impact to confidentiality, integrity and availability per the CVSS vector. In practice this enables full control of the host from a low-privileged local position.

Attack surface

The vector is local (AV:L) with low privileges required (PR:L) and no user interaction (UI:N), so the flaw is reached by running code on the target machine rather than over the network. No remote or unauthenticated path is described.

Exploitation

CVE-2019-0808 is listed in CISA KEV with a 2021-11-03 addition date, and public exploit code is referenced (Packet Storm, tagged Exploit). EPSS 30-day probability is 0.53017 (98.9th percentile), indicating high likelihood of exploitation activity.

What to do

• Apply the Microsoft security update referenced in the vendor advisory (portal.msrc.microsoft.com) as the primary fix.
• Prioritize patching Windows 7 and Windows Server 2008 systems, which are the products named in the record.
• Restrict local interactive and service account privileges to limit the low-privileged foothold this exploit requires.
• Monitor for and block known exploit tooling tied to the NtUserMNDragOver local privilege escalation path.
• Where legacy systems cannot be patched, isolate them and apply compensating endpoint controls.

Detection

• Alert on unexpected elevation of low-privileged processes to SYSTEM or high-integrity tokens on Windows 7 and Server 2008 hosts.
• Hunt for processes invoking win32k-related system calls or NtUserMNDragOver patterns outside normal application behavior.
• Correlate local privilege escalation events with prior suspicious process execution on the same host.
• Review endpoint telemetry for known public exploit artifacts matching the Packet Storm reference.

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