What is the CVSS score of CVE-2025-49689?

CVE-2025-49689 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Windows Server 2022 23h2 are affected by CVE-2025-49689?

CVE-2025-49689 is a privilege escalation vulnerability in Windows Virtual Hard Disk (VHDX) handling that allows local attackers to gain elevated system privileges through integer overflow…. A patch is available.

How to fix or mitigate CVE-2025-49689?

Within 24 hours: identify all systems using VHDX disk images or Hyper-V by querying patch management and asset inventory systems. Within 7 days: apply the available vendor patch to all affected Windows servers and client systems; verify patch installation with deployment confirmation tools. Within 30 days: conduct audit of local user account privileges on patched systems and review Hyper-V access controls to ensure least-privilege configuration.

Windows Server 2022 23h2 CVE-2025-49689

EUVD-2025-20635 HIGH

Out-of-bounds Read (CWE-125)

2025-07-08 secure@microsoft.com

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

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/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

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:30 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

10.0.14393.8246,10.0.22631.5624,6.1.7601.27820

EUVD ID Assigned

Mar 16, 2026 - 04:21 euvd

EUVD-2025-20635

Analysis Generated

Mar 16, 2026 - 04:21 vuln.today

CVE Published

Jul 08, 2025 - 17:15 nvd

HIGH 7.8

DescriptionCVE.org

Integer overflow or wraparound in Virtual Hard Disk (VHDX) allows an unauthorized attacker to elevate privileges locally.

Analysis

Integer overflow or wraparound in Virtual Hard Disk (VHDX) allows an unauthorized attacker to elevate privileges locally.

Technical ContextAI

An out-of-bounds memory access occurs when code reads from or writes to memory locations outside the intended buffer boundaries. This vulnerability is classified as Out-of-bounds Read (CWE-125).