CVE-2019-0543 Microsoft Windows Privilege Escalation

Exploited in the wild High 7.8 Published 8 Jan 2019 Updated 12 Jan 2026

Attackers can exploit improper authentication handling in Windows to elevate privileges on affected systems.

Exploited in the wild: Since 15 Mar 2022
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-0543?

CVE-2019-0543 is a high-severity authentication bypass vulnerability in Microsoft Windows 10 1507, published on 8 Jan 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An elevation of privilege vulnerability exists when Windows improperly handles authentication requests, aka "Microsoft Windows Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.

Weakness: CWE-287

Which versions are affected by CVE-2019-0543?

It affects 15 products.

Products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1703, Microsoft Windows 10 1709, Microsoft Windows 10 1803, Microsoft Windows 10 1809 and 9 more.

How do I fix CVE-2019-0543?

No fix has been published for CVE-2019-0543 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 5 Apr 2022.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2019-0543 being exploited?

Yes. Attackers have exploited CVE-2019-0543 in the wild since at least 15 Mar 2022, including in ransomware campaigns.

Public exploit code: 1 Exploit-DB entry.

All Microsoft Windows 10 1507 vulnerabilities

Sources

Also known as GHSA-3vmp-cf5x-w457.