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Vulnerability record · CVE-2019-1019 · published 12 June 2019

CVE-2019-1019: Microsoft windows 10 information exposure vulnerability

Microsoft · Windows 10

A security feature bypass vulnerability exists where a NETLOGON message is able to obtain the session key and sign messages. To exploit this vulnerability, an attacker could send a specially crafted authentication request. An attacker who successfully exploited this vulnerability could access another machine using the original user privileges. The issue has been addressed by changing how NTLM validates network authentication messages.

8.5 CVSS 3.1 High EPSS 15% · top 3.4% CWE-200 · Information exposure
8.5CVSS 3.1 base score, v2 6.0
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

A security feature bypass vulnerability exists where a NETLOGON message is able to obtain the session key and sign messages. To exploit this vulnerability, an attacker could send a specially crafted authentication request. An attacker who successfully exploited this vulnerability could access another machine using the original user privileges. The issue has been addressed by changing how NTLM validates network authentication messages.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1019
http://packetstormsecurity.com/files/153639/Microsoft-Windows-HTTP-To-SMB-NTLM-Reflection-Privilege-Escalation.html Third Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1019 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-1019), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.