What’s Vulnerable › Vulnerabilities

CVE-2019-1338

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-10 · updated 2026-06-17

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 Windows 7: all versions
• Microsoft Windows Server 2008: r2-sp1
• Microsoft Corporation Windows: 7 for 32-bit Systems Service Pack 1, 7 for x64-based Systems Service Pack 1
• Microsoft Windows Server: 2008 R2 for x64-based Systems Service Pack 1 (Core installation), 2008 R2 for Itanium-Based Systems Service Pack 1, 2008 R2 for x64-based Systems Service Pack 1, 2008 for 32-bit Systems Service Pack 2 (Core installation), 2008 for Itanium-Based Systems Service Pack 2, 2008 for 32-bit Systems Service Pack 2 (+2)

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1338
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1338

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