CVE-2025-49666

Name: CVE-2025-49666
Creator: NVD / NIST
Published: 2025-07-08T17:15:49.83+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.15%

Last modified Jun 17, 2026

CVE-2025-49666 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.. EPSS estimates a 1.15% chance of exploitation in the next 30 days.

Description

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

1.15%

63.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-122

Affected Software

Vendor	Product	Versions
Microsoft	Windows Server 2016	< 10.0.14393.8246
Microsoft	Windows Server 2019	< 10.0.17763.7558
Microsoft	Windows Server 2022	< 10.0.20348.3932
Microsoft	Windows Server 2022 23h2	< 10.0.25398.1732
Microsoft	Windows Server 2025	< 10.0.26100.4652

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49666Vendor Advisory

Timeline

Published: Jul 8, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-49666?

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to execute code over a network.

How severe is CVE-2025-49666?

CVE-2025-49666 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.15% probability of exploitation in the next 30 days.

How do I fix CVE-2025-49666?

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-2025-49666?

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

Scan your code now

Source: NVD / NIST