CVE-2025-21295

Name: CVE-2025-21295
Creator: NVD / NIST
Published: 2025-01-14T18:15:51.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.55%

Last modified Jun 17, 2026

CVE-2025-21295 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability. EPSS estimates a 1.55% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.55%

72.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 10 1507	< 10.0.10240.20890	—
Microsoft	Windows 10 1607	< 10.0.14393.7699	—
Microsoft	Windows 10 1809	< 10.0.17763.6775	—
Microsoft	Windows 10 21h2	< 10.0.19044.5371	—
Microsoft	Windows 10 22h2	< 10.0.19045.5371	—
Microsoft	Windows 11 22h2	< 10.0.22621.4751	—
Microsoft	Windows 11 23h2	< 10.0.22631.4751	—
Microsoft	Windows 11 24h2	< 10.0.26100.2894	—
Microsoft	Windows Server 2008	r2	Sp1
Microsoft	Windows Server 2012	All versions	—
Microsoft	Windows Server 2012	r2	—
Microsoft	Windows Server 2016	< 10.0.14393.7699	—
Microsoft	Windows Server 2019	< 10.0.17763.6775	—
Microsoft	Windows Server 2022	< 10.0.20348.3091	—
Microsoft	Windows Server 2022 23h2	< 10.0.25398.1369	—
Microsoft	Windows Server 2025	< 10.0.26100.2894	—

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21295Patch, Vendor Advisory

Timeline

Published: Jan 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-21295?

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

How severe is CVE-2025-21295?

CVE-2025-21295 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.55% probability of exploitation in the next 30 days.

How do I fix CVE-2025-21295?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21295?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST