What is the CVSS score of CVE-2025-49740?

CVE-2025-49740 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Windows Server 2019 are affected by CVE-2025-49740?

CVE-2025-49740 is a high-severity vulnerability in Windows SmartScreen that allows network-based attackers to bypass a critical protective filter, potentially enabling distribution of malware or…. A patch is available.

How to fix or mitigate CVE-2025-49740?

Within 24 hours: Identify all Windows systems with SmartScreen enabled and verify current patch status through WSUS or endpoint management tools. Within 7 days: Deploy vendor-released patch to all affected systems prioritizing internet-facing and user-accessible endpoints. Within 30 days: Complete patch deployment across entire Windows estate and validate SmartScreen functionality post-update through security scanning.

Windows Server 2019 CVE-2025-49740

EUVD-2025-20537 HIGH

Protection Mechanism Failure (CWE-693)

2025-07-08 secure@microsoft.com

Microsoft Authentication Bypass Windows Server 2019 Windows 10 22h2 Windows Server 2025 Windows 10 1507 Windows 10 1607 Windows 11 24h2 Windows 11 22h2 Windows Server 2022 Windows Server 2016 Windows 10 1809 Windows 11 23h2 Windows 10 21h2 Windows Server 2022 23h2 Windows

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:28 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

10.0.14393.8246,10.0.17763.7558,10.0.25398.1732

EUVD ID Assigned

Mar 16, 2026 - 04:21 euvd

EUVD-2025-20537

Analysis Generated

Mar 16, 2026 - 04:21 vuln.today

CVE Published

Jul 08, 2025 - 17:16 nvd

HIGH 8.8

DescriptionCVE.org

Protection mechanism failure in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.

Analysis

Protection mechanism failure in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.

Technical ContextAI

This vulnerability is classified as Protection Mechanism Failure (CWE-693).

RemediationAI

Monitor vendor advisories for patches. Apply mitigations such as network segmentation, access restrictions, and monitoring.

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CVE-2025-49740 vulnerability details – vuln.today

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Windows Server 2019 CVE-2025-49740

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

Analysis

Technical ContextAI

RemediationAI

More in Windows Server 2019

Same weakness CWE-693 – Protection Mechanism Failure

Same technique Authentication Bypass

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External POC / Exploit Code