CVE-2025-49666

HIGH

Windows Server 2016/2019/2022/2025 Authenticated RCE via Heap-based Buffer Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2025-49666. PoCs published by 17patmaks.

AI-analyzed exploit summary This repository contains Sigma rules for detecting exploitation attempts of CVE-2025-49666, a heap buffer overflow in the Windows SBEC service, rather than functional exploit code. The rules focus on process creation and crash patterns indicative of exploitation.

Description

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

Exploits (1)

nomisec SCANNER
by 17patmaks · poc
https://github.com/17patmaks/My-Sigma-Rule-Collection

This repository contains Sigma rules for detecting exploitation attempts of CVE-2025-49666, a heap buffer overflow in the Windows SBEC service, rather than functional exploit code. The rules focus on process creation and crash patterns indicative of exploitation.

Classification
Scanner 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Windows Setup and Boot Event Collection (SBEC) service
No auth needed
Prerequisites: Access to the target system's process logs · Sigma rule deployment in a SIEM or detection system
devstral-2 · analyzed Feb 19, 2026 Full analysis →

References (1)

Core 1
Core References

Scores

CVSS v3 7.2
EPSS 0.0115
EPSS Percentile 62.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-122
Status published
Products (5)
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
Published Jul 08, 2025
Tracked Since Feb 18, 2026