What is the CVSS score of CVE-2025-49659?

CVE-2025-49659 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Windows are affected by CVE-2025-49659?

CVE-2025-49659 is a privilege escalation vulnerability in Windows TDX.sys that allows authenticated local users to gain elevated system privileges.. A patch is available.

How to fix or mitigate CVE-2025-49659?

Within 24 hours: Identify all Windows systems running TDX.sys and verify current patch status. Within 7 days: Apply the vendor-released patch to all affected systems, prioritizing domain-joined workstations and servers. Within 30 days: Validate patch deployment across the entire Windows fleet and confirm TDX.sys version matches the patched release.

Windows CVE-2025-49659

EUVD-2025-20583 HIGH

Buffer Over-read (CWE-126)

2025-07-08 secure@microsoft.com

Windows Buffer Overflow Microsoft Windows 10 1507 Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 22h2 Windows 11 23h2 Windows 11 24h2 Windows Server 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2022 23h2 Windows Server 2025

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:31 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

6.0.6003.23418,10.0.17763.7558,6.1.7601.27820

EUVD ID Assigned

Mar 16, 2026 - 04:21 euvd

EUVD-2025-20583

Analysis Generated

Mar 16, 2026 - 04:21 vuln.today

CVE Published

Jul 08, 2025 - 17:15 nvd

HIGH 7.8

DescriptionCVE.org

Buffer over-read in Windows TDX.sys allows an authorized attacker to elevate privileges locally.

Analysis

Buffer over-read in Windows TDX.sys allows an authorized attacker to elevate privileges locally.

Technical ContextAI

This vulnerability is classified as Buffer Over-read (CWE-126).

RemediationAI

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

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CVE-2025-49659 vulnerability details – vuln.today

Back

Windows CVE-2025-49659

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

Analysis

Technical ContextAI

RemediationAI

More in Windows

Same weakness CWE-126 – Buffer Over-read

Same technique Buffer Overflow

Share

External POC / Exploit Code