What is CVE-2019-0543?

CVE-2019-0543 is a high-severity vulnerability in Microsoft Windows 10 1507, classified under Improper Authentication. CVSS score: 7.8/10. Published 2019-01-08.

How severe is CVE-2019-0543?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2019-0543 known to be exploited?

Yes. CVE-2019-0543 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.

Auth bypass in Microsoft Windows 10 1507

CVE-2019-0543

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.

Vulnerability class: Broken Authentication

Published 2019-01-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.047 (91.7th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.047 · newest: 0.047 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-287 — Improper Authentication

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-03-15. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-04-05.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

www.securityfocus.com/bid/106408 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0543 (Patch, Vendor Advisory)
www.exploit-db.com/exploits/46156/ (Exploit, VDB Entry, Third Party Advisory, exploit)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2019-0543?: CVE-2019-0543 is a high-severity vulnerability in Microsoft Windows 10 1507, classified under Improper Authentication. CVSS score: 7.8/10. Published 2019-01-08.
How severe is CVE-2019-0543?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2019-0543 known to be exploited?: Yes. CVE-2019-0543 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.