Integer overflow in Microsoft Windows and Windows Server - CVE-2025-54895

Vulnerability identifier: #VU115108

CSH Severity: Low

CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-54895

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the target system.

The vulnerability exists due to integer overflow in SPNEGO Extended Negotiation (NEGOEX) Security Mechanism. A local user can pass specially crafted data to the application, trigger integer overflow and gain elevated privileges on the target system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.6332, 10 22H2 10.0.19045.6332, 10 1507 10.0.10240.21128, 10 1607 10.0.14393.8422, 10 1809 10.0.17763.7792, 11 22H2 10.0.22621.5909, 11 23H2 10.0.22631.5909, 11 24H2 10.0.26100.6508, 11 24H2 10.0.26100.6584
Windows Server - addressed in versions 2008 R2 6.1.7601.27929, 2012 R2 6.3.9600.22774, 2012 6.2.9200.25675, 2016 10.0.14393.8422, 2019 10.0.17763.7792, 2022 23H2 10.0.25398.1849, 2022 10.0.20348.4106, 2022 10.0.20348.4171, 2025 10.0.26100.6508, 2025 10.0.26100.6584

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-54895

• Privilege escalation in Microsoft SPNEGO Extended Negotiation (NEGOEX) Security Mechanism