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Vulnerability · Published Jan 14, 2025 · Assigned by microsoft

CVE-2025-21295SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability

High 8.1

In plain English

A high-severity use-after-free in Windows 10 Version 1507 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)1.6%top 23.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability

Affected products (as reported)

VendorProductVersions
Microsoft Windows 10 Version 1507 10.0.10240.0 – before 10.0.10240.20890
Microsoft Windows 10 Version 1607 10.0.14393.0 – before 10.0.14393.7699
Microsoft Windows 10 Version 1809 10.0.17763.0 – before 10.0.17763.6775
Microsoft Windows 10 Version 21H2 10.0.19044.0 – before 10.0.19044.5371
Microsoft Windows 10 Version 22H2 10.0.19045.0 – before 10.0.19045.5371
Microsoft Windows 11 version 22H2 10.0.22621.0 – before 10.0.22621.4751
Microsoft Windows 11 version 22H3 10.0.22631.0 – before 10.0.22631.4751
Microsoft Windows 11 Version 23H2 10.0.22631.0 – before 10.0.22631.4751
Microsoft Windows 11 Version 24H2 10.0.26100.0 – before 10.0.26100.2894
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0 – before 6.1.7601.27520
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 – before 6.1.7601.27520
Microsoft Windows Server 2012 6.2.9200.0 – before 6.2.9200.25273
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 – before 6.2.9200.25273
Microsoft Windows Server 2012 R2 6.3.9600.0 – before 6.3.9600.22371
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 – before 6.3.9600.22371
Microsoft Windows Server 2016 10.0.14393.0 – before 10.0.14393.7699
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 – before 10.0.14393.7699
Microsoft Windows Server 2019 10.0.17763.0 – before 10.0.17763.6775
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 – before 10.0.17763.6775
Microsoft Windows Server 2022 10.0.20348.0 – before 10.0.20348.3091
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 – before 10.0.25398.1369
Microsoft Windows Server 2025 10.0.26100.0 – before 10.0.26100.2894
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 – before 10.0.26100.2894

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

References