Is CVE-2019-1458 being actively exploited?

Yes. CVE-2019-1458 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on January 10, 2022.

What is the CVSS score for CVE-2019-1458?

CVE-2019-1458 has a CVSS 3.1 base score of 7.8 (HIGH).

CVE-2019-1458

HIGH · CVSS 7.8CISA KEV: actively exploitedEPSS 74.4%EU EUVD: exploited

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k Elevation of Privilege Vulnerability'.

Key facts

CVSS score: 7.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS score: 74.4% (99th percentile)
In CISA KEV: Yes, added January 10, 2022
In EU EUVD: Yes (EUVD-2019-10015)
Published: December 10, 2019
NVD last modified: August 12, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Microsoft Win32k Privilege Escalation Vulnerability

Added to the KEV catalog on January 10, 2022; federal remediation due July 10, 2022. Known to be used in ransomware campaigns.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2019-10015 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on August 12, 2026.

View on the EU Vulnerability Database

Affected products

microsoft / windows 10 1507
microsoft / windows 10 1507
microsoft / windows 10 1607
microsoft / windows 10 1607
microsoft / windows 7
microsoft / windows 8.1
microsoft / windows rt 8.1
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2012
microsoft / windows server 2012
microsoft / windows server 2016

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Windows 7 BitLocker™ Drive Encryption - Microsoft Corporation - FIPS 140 1332 - historical
Microsoft Windows 7 Kernel Mode Cryptographic Primitives Library (cng.sys) - Microsoft Corporation - FIPS 140 1328 - historical

References

http://packetstormsecurity.com/files/156651/Microsoft-Windows-WizardOpium-Local-Privilege-Escalation.html(Exploit, Third Party Advisory, VDB Entry)
http://packetstormsecurity.com/files/159569/Microsoft-Windows-Uninitialized-Variable-Local-Privilege-Escalation.html(Exploit, Third Party Advisory, VDB Entry)
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1458(Patch, Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-1458(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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