CVE-2019-1040: microsoft windows_10
Vulnerability summary
CVE-2019-1040 is a medium (CVSS 5.9) vulnerability in microsoft windows_10. EPSS estimates a 48.04% chance of exploitation in the next 30 days, higher than 98.8% of scored vulnerabilities.
Timeline
- 12-06-2019PublishedVulnerability first disclosed.
- 20-05-2025Last modifiedVulnerability information updated.
Description
A tampering vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLM MIC (Message Integrity Check) protection. An attacker who successfully exploited this vulnerability could gain the ability to downgrade NTLM security features. To exploit this vulnerability, the attacker would need to tamper with the NTLM exchange. The attacker could then modify flags of the NTLM packet without invalidating the signature. The update addresses the vulnerability by hardening NTLM MIC protection on the server-side.
CVSS metrics
4 scores · 2 sources · 3 versions- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS trend
Probability
48.04%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
0.00 pp
From 48.04% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Microsoft32 products
- windows_10na | 1607 | 1703 | 1709 | 1803 | 1809 | 1903
- windows 10 version 1507≥ 10.0.10240.0, < publication
- windows 10 version 1607≥ 10.0.14393.0, < publication
- windows 10 version 1703≥ 10.0.0, < publication
- windows 10 version 1709≥ 10.0.0, < publication
1 vendor · 32 products
References
2 links
msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1040Vendor Advisory- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1040X Refsource MISCX TransferredPatchVendor Advisory