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.
References
| Link | Resource |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1040 | |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1040 | Patch Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
20 May 2025, 18:15
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : 4.3
v3 : 5.3 |
| Summary | (en) 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. | |
| References |
|
21 Nov 2024, 04:35
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1040 - Patch, Vendor Advisory |
Information
Published : 2019-06-12 14:29
Updated : 2025-05-20 18:15
NVD link : CVE-2019-1040
Mitre link : CVE-2019-1040
CVE.ORG link : CVE-2019-1040
JSON object : View
Products Affected
microsoft
- windows_server_2016
- windows_rt_8.1
- windows_10
- windows_server_2008
- windows_7
- windows_server_2019
- windows_server_2012
- windows_8.1
CWE