Vulnerability in Microsoft Windows 10
CVE-2019-1040
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.480 (98.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.480 · newest: 0.480 · change: 0.000
Affected products
- Microsoft Windows 10 — versions 1607, 1703, 1709
- Microsoft Windows 10 Version 1507 — versions 10.0.10240.0
- Microsoft Windows 10 Version 1607 — versions 10.0.14393.0
- Microsoft Windows 10 Version 1703 — versions 10.0.0
- Microsoft Windows 10 Version 1709 — versions 10.0.0
- Microsoft Windows 10 Version 1709 For 32-Bit Systems — versions 10.0.0
- Microsoft Windows 10 Version 1803 — versions 10.0.0
- Microsoft Windows 10 Version 1809 — versions 10.0.0, 10.0.17763.0
- Microsoft Windows 10 Version 1903 For 32-Bit Systems — versions 10.0.0
- Microsoft Windows 10 Version 1903 For Arm64-Based Systems — versions 10.0.0
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1040 (vendor-advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2019-1040?
- CVE-2019-1040 is a medium-severity vulnerability in Microsoft Windows 10. CVSS score: 5.3/10. Published 2019-06-12.
- How severe is CVE-2019-1040?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2019-1040 known to be exploited?
- 113 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.