CVE-2019-1338

MEDIUMCVSS 5.9/10EPSS 3.32%

Last modified

CVE-2019-1338 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses, aka 'Windows NTLM Security Feature Bypass Vulnerability'.. EPSS estimates a 3.32% chance of exploitation in the next 30 days.

Description

A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses, aka 'Windows NTLM Security Feature Bypass Vulnerability'.

Metrics

CVSS 3.1
5.9/10

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

EPSS Probability
3.32%

87.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersionsUpdate
MicrosoftWindows 7All versionsSp1
MicrosoftWindows Server 2008All versionsSp2
MicrosoftWindows Server 2008r2Sp1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-1338?
A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses, aka 'Windows NTLM Security Feature Bypass Vulnerability'.
How severe is CVE-2019-1338?
CVE-2019-1338 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 3.32% probability of exploitation in the next 30 days.
How do I fix CVE-2019-1338?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-1338?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST