CVE-2026-41089

CRITICAL EXPLOITED

Microsoft Windows Server 2012 - Windows Netlogon Remote Code Execution Vulnerability

Title source: rule
STIX 2.1

Exploitation Summary

CVE-2026-41089 has been observed exploited in the wild (reported by VulnCheck KEV). EIP tracks 27 public exploits from researchers including Darkuoremember32, hnytgl, ADScanPro.

AI-analyzed exploit summary This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow in Windows Netlogon via CLDAP. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, causing a crash and potential remote code execution on unpatched Windows Domain Controllers.

Description

Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

Exploits (27)

github WORKING POC 70 stars
by Darkuoremember32 · pythonpoc
https://github.com/Darkuoremember32/CVE-2026-41089-470

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow in Windows Netlogon via CLDAP. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, causing a crash and potential remote code execution on unpatched Windows Domain Controllers.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 04, 2026 Full analysis →
github WORKING POC 70 stars
by Darkuoremember32 · pythonpoc
https://github.com/Darkuoremember32/CVE-2026-41089-532

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP (UDP 389). The exploit sends a crafted CLDAP ping request with an oversized username to trigger a buffer overflow in LSASS, leading to a crash and potential remote code execution on unpatched Windows Domain Controllers.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 (Domain Controllers)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 04, 2026 Full analysis →
github WORKING POC 2 stars
by hnytgl · pythonremote
https://github.com/hnytgl/CVE-2026-41089

This repository contains a functional exploit for CVE-2026-41089, a critical stack-based buffer overflow in Windows Netlogon's CLDAP service. The exploit leverages a Unicode string handling vulnerability to achieve remote code execution with SYSTEM privileges on Windows Server 2012-2025 domain controllers via UDP port 389.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Windows Server 2012-2025 (Netlogon service)
No auth needed
Prerequisites: Target must be a domain controller with UDP 389 exposed · No authentication required
devstral-2 · analyzed Jun 03, 2026 Full analysis →
github SCANNER 1 stars
by ADScanPro · pythonpoc
https://github.com/ADScanPro/CVE-2026-41089-LongLogon

This repository contains a non-destructive precondition checker for CVE-2026-41089, a Netlogon stack buffer overflow vulnerability. It probes domain controllers to determine if their DNS domain names are long enough to trigger the overflow without actually exploiting it.

Classification
Scanner 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Netlogon service
No auth needed
Prerequisites: Domain controller with a long DNS domain name (~90+ characters)
devstral-2 · analyzed Jun 03, 2026 Full analysis →
github WORKING POC 1 stars
by 0xABCD01 · pythonpoc
https://github.com/0xABCD01/CVE-2026-41089

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack-based buffer overflow in Windows Netlogon via CLDAP. The exploit crafts a malicious CLDAP ping with an oversized username to trigger a buffer overflow in LSASS, leading to a crash and potential RCE.

Classification
Working Poc 100%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012-2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 01, 2026 Full analysis →
github WORKING POC
by Coasttruvitalize · pythonpoc
https://github.com/Coasttruvitalize/CVE-2026-41089-latest

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in the Netlogon service via CLDAP ping requests. The exploit demonstrates the vulnerability by sending a crafted CLDAP packet with an oversized username to trigger a buffer overflow in the Netlogon service, potentially causing a denial-of-service (DoS) condition.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 09, 2026 Full analysis →
github WORKING POC
by SpiralSealFill · pythonpoc
https://github.com/SpiralSealFill/CVE-2026-41089-hub

This repository contains a functional PoC for CVE-2026-41089, a stack buffer overflow in Netlogon via CLDAP ping requests. The exploit sends a crafted UDP packet to trigger a buffer overflow in the Netlogon service, potentially causing a DoS (LSASS crash) on Windows Server 2012 through 2025 Domain Controllers.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (Netlogon service)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 09, 2026 Full analysis →
github SUSPICIOUS
by jenniferreire26 · poc
https://github.com/jenniferreire26/CVE-2026-41089

The repository lacks actual exploit code and instead directs users to an external download link (tinyurl.com). The README provides minimal technical details and reads more like a generic vulnerability summary rather than a legitimate PoC or writeup.

Classification
Suspicious 90%
Attack Type
Other
Complexity
Theoretical
Reliability
Theoretical
Target: Microsoft Windows Server (various versions)
No auth needed
Prerequisites: none specified
devstral-2 · analyzed Jun 09, 2026 Full analysis →
github WORKING POC
by RoyalViceroyBear · pythonpoc
https://github.com/RoyalViceroyBear/CVE-2026-41089-706

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in the Netlogon service of Windows Domain Controllers. The exploit sends a crafted CLDAP ping request with an oversized username to trigger the overflow, leading to a denial-of-service (DoS) condition.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by CrimsonKingfisher · pythonpoc
https://github.com/CrimsonKingfisher/CVE-2026-41089-245

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Netlogon via CLDAP ping requests. The exploit sends a crafted CLDAP packet with an oversized username to trigger a buffer overflow in Windows Server 2012 through 2025 Domain Controllers, leading to LSASS crash and potential remote code execution.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by Powderbatpatch · pythonpoc
https://github.com/Powderbatpatch/CVE-2026-41089-397

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP ping requests. The PoC demonstrates the vulnerability by sending a crafted UDP packet to trigger a buffer overflow in LSASS, leading to a crash and potential remote code execution.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by StampDreamFitting · pythonpoc
https://github.com/StampDreamFitting/CVE-2026-41089-986

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP (UDP 389). The exploit sends a crafted CLDAP ping request with an oversized username to trigger a buffer overflow in netlogon!NetpLogonPutUnicodeString, leading to LSASS crash and potential RCE.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by segmentjoninsecret · pythonpoc
https://github.com/segmentjoninsecret/CVE-2026-41089-334

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, leading to a crash and potential remote code execution.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by raingatorrouter · pythonpoc
https://github.com/raingatorrouter/CVE-2026-41089-224

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP. The PoC sends a crafted UDP packet to trigger the overflow, potentially causing LSASS to crash and the domain controller to reboot.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target domain controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by raingatorrouter · pythonpoc
https://github.com/raingatorrouter/CVE-2026-41089-953

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, causing a crash and potential remote code execution.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by SightFinchFall · pythonpoc
https://github.com/SightFinchFall/CVE-2026-41089-238

This repository contains a functional PoC for CVE-2026-41089, a Netlogon stack buffer overflow via CLDAP ping. The exploit sends a crafted CLDAP request with an oversized username to trigger a buffer overflow in the Netlogon service, leading to a DoS (LSASS crash) and potential RCE.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
nomisec WORKING POC
by sectiondukestring25 · poc
https://github.com/sectiondukestring25/CVE-2026-41089-971

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow in the Netlogon service via CLDAP ping requests. The exploit sends a crafted CLDAP packet with an oversized username to trigger a buffer overflow in the Netlogon service, potentially causing a denial-of-service (DoS) or remote code execution (RCE).

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by Mapclaregister · pythonpoc
https://github.com/Mapclaregister/CVE-2026-41089-191

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, leading to a crash and potential remote code execution.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 06, 2026 Full analysis →
github WORKING POC
by GalleryJoiner · pythonpoc
https://github.com/GalleryJoiner/CVE-2026-41089-686

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP ping requests. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, causing a crash and reboot of the domain controller.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target domain controller
devstral-2 · analyzed Jun 05, 2026 Full analysis →
github WORKING POC
by Planetpliexpose · pythonpoc
https://github.com/Planetpliexpose/CVE-2026-41089-277

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP. The PoC sends a crafted UDP packet to trigger the overflow, causing LSASS to crash and the domain controller to reboot.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target domain controller
devstral-2 · analyzed Jun 05, 2026 Full analysis →
github WORKING POC
by SkySmokeMoat · pythonpoc
https://github.com/SkySmokeMoat/CVE-2026-41089-552

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, potentially causing a crash or reboot of the Domain Controller.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 05, 2026 Full analysis →
github TROJAN
by senseibreathhovel · pythonpoc
https://github.com/senseibreathhovel/CVE-2026-41089-663

The repository contains a functional PoC for CVE-2026-41089 (Netlogon stack buffer overflow via CLDAP) but also includes a malicious setup.py script that extracts and executes an embedded executable, indicating deceptive intent.

Classification
Trojan 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 05, 2026 Full analysis →
github WORKING POC
by System32manager · pythonpoc
https://github.com/System32manager/CVE-2026-41089-699

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP. The exploit sends a crafted UDP packet to trigger a buffer overflow in LSASS, leading to a crash and potential remote code execution.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 05, 2026 Full analysis →
github SCANNER
by hnytgl · pythonpoc
https://github.com/hnytgl/cve-2026-41089-detector

This repository contains a Python-based detection tool for CVE-2026-41089, a Windows Netlogon RCE vulnerability. The script checks for vulnerable systems by analyzing netlogon.dll versions, installed KB updates, and OS build numbers without exploiting the vulnerability.

Classification
Scanner 100%
Attack Type
Info Leak
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012-2025 (Netlogon component)
Auth required
Prerequisites: Access to target system via CIM/WMI or local execution · Domain controller role for vulnerability context
devstral-2 · analyzed Jun 03, 2026 Full analysis →
github SUSPICIOUS
by sananpa · poc
https://github.com/sananpa/CVE-2026-41089

The repository lacks actual exploit code and instead redirects users to an external download link (tinyurl.com). The README provides minimal technical details and focuses on generic usage instructions without demonstrating any understanding of the vulnerability.

Classification
Suspicious 90%
Attack Type
Other
Complexity
Theoretical
Reliability
Theoretical
Target: Microsoft Windows Server (multiple versions)
No auth needed
Prerequisites: network access to target
devstral-2 · analyzed Jun 02, 2026 Full analysis →
github WRITEUP
by 0xBlackash · poc
https://github.com/0xBlackash/CVE-2026-41089

This repository provides a detailed technical analysis of CVE-2026-41089, a critical stack-based buffer overflow in Windows Netlogon allowing unauthenticated RCE. It includes vulnerability details, attack scenarios, and mitigation strategies but lacks functional exploit code.

Classification
Writeup 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Theoretical
Target: Windows Netlogon (Domain Controllers)
No auth needed
Prerequisites: Network access to vulnerable domain controller · Crafted Netlogon request
devstral-2 · analyzed Jun 02, 2026 Full analysis →
vulncheck_xdb WORKING POC
dos
https://github.com/Vanquishermacdetach/CVE-2026-41089-509

This repository contains a functional proof-of-concept exploit for CVE-2026-41089, a stack buffer overflow vulnerability in Windows Netlogon via CLDAP (UDP 389). The exploit sends a crafted CLDAP ping request with an oversized username to trigger a buffer overflow in LSASS, leading to a crash and potential remote code execution.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: Windows Server 2012 through 2025 Domain Controllers (pre-patch)
No auth needed
Prerequisites: Network access to UDP port 389 on the target Domain Controller
devstral-2 · analyzed Jun 04, 2026 Full analysis →

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Windows Netlogon Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089

Scores

CVSS v3 9.8
EPSS 0.4379
EPSS Percentile 98.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact total

Details

VulnCheck KEV 2026-05-29
CWE
CWE-121
Status published
Products (19)
Microsoft/Windows Server 2012 6.2.9200.0 - 6.2.9200.26079
Microsoft/Windows Server 2012 (Server Core installation) 6.2.9200.0 - 6.2.9200.26079
Microsoft/Windows Server 2012 R2 6.3.9600.0 - 6.3.9600.23181
Microsoft/Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 - 6.3.9600.23181
Microsoft/Windows Server 2016 10.0.14393.0 - 10.0.14393.9140
Microsoft/Windows Server 2016 (Server Core installation) 10.0.14393.0 - 10.0.14393.9140
Microsoft/Windows Server 2019 10.0.17763.0 - 10.0.17763.8755
Microsoft/Windows Server 2019 (Server Core installation) 10.0.17763.0 - 10.0.17763.8755
Microsoft/Windows Server 2022 10.0.20348.0 - 10.0.20348.5139
Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 - 10.0.25398.2330
... and 9 more
Published May 12, 2026
Tracked Since May 12, 2026