CVE-2019-1040
high-risk
Published 2019-06-12
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.
Do I need to act?
!
89.7% chance of exploitation in next 30 days
EPSS score — higher than 10% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10
Medium
NETWORK
/ HIGH complexity
Affected Products (19)
Affected Vendors
56
/ 100
high-risk
Severity
17/34 · Moderate
Exploitability
20/34 · Moderate
Exposure
19/34 · Moderate