Medium severity5.9NVD Advisory· Published Oct 10, 2019· Updated Jun 17, 2026

CVE-2019-1338

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'.

Affected products

Microsoft/Windowsllm-fuzzy2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: 7 for 32-bit Systems Service Pack 1
Microsoft/Windows Server 2003cpe-rescue
Range: 2008 R2 for x64-based Systems Service Pack 1 (Core installation)

Patches

Vulnerability mechanics

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1338nvdPatchVendor Advisory

News mentions

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cvss	0.384
epss	0.003
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000