CVE-2025-55697: Azure Local Elevation of Privilege Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Elevation of Privilege

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2025-Oct

Released

2025-10-14

EPSS Score

0.07% (percentile: 20.3%)

Description

Heap-based buffer overflow in Azure Local allows an authorized attacker to elevate privileges locally.

FAQ

What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected Products (3)

Windows

• Windows Server 2025 (Server Core installation)
• Windows Server 2022, 23H2 Edition (Server Core installation)
• Windows Server 2025

Security Updates (2)

• 5066835
• 5066780

Acknowledgments

Microsoft Offensive Research & Security Engineering (MORSE)

Revision History

• 2025-10-14: Information published.