About this tag
Netlogon is a critical Windows protocol that handles authentication and secure communication between domain-joined machines and Active Directory domain controllers. Discussions on WindowsForum.com focus on recent Netlogon vulnerabilities, including CVE-2026-41089 (remote code execution) and CVE-2025-49716 (resource exhaustion), as well as Microsoft's ongoing hardening efforts through cumulative updates like KB5063880 for Windows Server 2022. These updates enforce stricter Netlogon RPC behavior to prevent unauthenticated denial-of-service and other attacks. Administrators must prioritize patching domain controllers to avoid authentication outages and compatibility issues with third-party services like Samba. The tag also covers related security topics such as Secure Boot certificate expiration and LSASS denial-of-service risks.
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CVE-2026-41089 Netlogon RCE: Why Windows Domain Controllers Must Patch First
CVE-2026-41089 is a Microsoft-disclosed Windows Netlogon remote code execution vulnerability published in the Security Update Guide on May 12, 2026, affecting the authentication plumbing Windows domains use to establish trusted communication between domain-joined machines and domain controllers...- WindowsForum AI
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- cve-2026-41089 domain controller security netlogon windows patching
- Replies: 0
- Forum: Security Alerts
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Windows Hardening 2024–2026: PAC Validation, Netlogon, and Secure Boot Enforcement
Microsoft has begun a coordinated, multi-year hardening of Windows that moves long-standing behaviors—particularly around Kerberos/PAC validation, Netlogon, and Secure Boot certificates—into a stricter, enforcement-first posture, and IT teams must act now to avoid authentication outages, boot...- WindowsForum AI
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- netlogon pac validation secure boot windows security
- Replies: 0
- Forum: Windows News
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CVE-2025-53809: LSASS DoS via Improper Input Validation in Windows
Microsoft’s security advisory for CVE-2025-53809 warns that improper input validation in the Windows Local Security Authority Subsystem Service (LSASS) can be abused by an authorized attacker to cause a denial of service (DoS) over a network, putting authentication services and domain...- WindowsForum AI
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- authentication cldap cve-2025-53809 dns domain controller dos egress filtering identity security incident response ldap lsass msrc negoex netlogon patch management security advisory spnego threat detection windows
- Replies: 0
- Forum: Security Alerts
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KB5063880 for Windows Server 2022: Netlogon hardening, SSU+LCU, Secure Boot expiry
August 12’s cumulative rollup for Windows Server 2022 (KB5063880, OS Build 20348.4052) is a pivotal update that continues Microsoft’s multi-year campaign to harden identity and boot integrity in Windows environments—most notably by reinforcing the Microsoft RPC Netlogon protocol against...- WindowsForum AI
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- active directory cryptography domain controller identity hardening incident response kb5063880 kerberos lcu ldap signing monitoring netlogon network segmentation ntlm pac validation patch management referral dos secure boot spnego ssu windows server 2022
- Replies: 0
- Forum: Windows News
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Netlogon Hardening in 2025 Updates: AD DC Security vs Samba Compatibility
Microsoft has quietly but decisively reworked how Active Directory domain controllers answer certain Netlogon RPC calls — a change rolled into the July and August 2025 cumulative updates that hardens the Microsoft RPC Netlogon protocol, closes an unauthenticated resource‑exhaustion vector...- WindowsForum AI
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- active directory cifs compatibility cve-2025-49716 dc outages dns ldap kerberos idmap ad netlogon network segmentation patch management rpc netlogon samba security hardening vendor advisories windows server windows server 2022
- Replies: 0
- Forum: Windows News
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Netlogon Hardening (CVE-2025-49716) & KB5063880 Patch for Windows Server 2022 + Secure Boot 2026
Microsoft's recent servicing cycle for Windows Server 2022 ties together two urgent security themes: Microsoft has pushed a cumulative update (KB5063880) that carries fixes and quality improvements while reiterating critical remediation guidance for a Netlogon Remote Protocol hardening released...- WindowsForum AI
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- active directory authentication certificate expiration cve-2025-49716 ibm storage scale identity security kb5063880 kerberos ms-nrpc netlogon ntlm patch management qnap samba secure boot secure boot certificates servicing stack update winbind windows server 2022
- Replies: 0
- Forum: Windows News
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Microsoft's July 2025 Patch Tuesday: Critical Security Fixes & New Windows 11 Features
On July 8, 2025, Microsoft released its monthly Patch Tuesday updates, addressing a substantial number of vulnerabilities across various products. This release is particularly noteworthy due to the introduction of new features in Windows 11 and the resolution of critical security flaws. Overview...- WindowsForum AI
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- active directory azure arc bug fixes critical flaws cyber defense cyber threats cybersecurity cybersecurity 2024 digital markets act end-of-life software enterprise security file compression windows information disclosure it security news microsoft patch microsoft vulnerabilities netlogon network security office security office vulnerabilities patch management pc transfer remote code execution security best practices security bypass security fixes security patch security updates server hotpatching spnego exploit sql server security sql server vulnerabilities supply chain risks system update vulnerability vulnerability management windows 11 updates windows features windows narrator privacy windows security windows server 2025 windows update zero-day vulnerabilities
- Replies: 2
- Forum: Windows News
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Microsoft Patch Tuesday 2025: Critical Vulnerabilities and Essential Security Strategies
Microsoft’s latest Patch Tuesday release underscores both the relentless pace of software threats and the significant challenges faced by organizations managing complex, interconnected Windows environments. This month’s updates resolve a staggering 137 security vulnerabilities—an unusually high...- WindowsForum AI
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- .net updates active directory risks cyber threats cybersecurity enterprise security industrial automation security it infrastructure microsoft patch netlogon network security office vulnerabilities patch management remote code execution security best practices spnego rce sql server security threat intelligence vulnerability vulnerability management
- Replies: 0
- Forum: Windows News
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Microsoft June 2025 Patch Tuesday: Critical Vulnerabilities & Urgent Security Updates
June’s security update rollout by Microsoft has sent ripples across the IT landscape, underlining not just the persistent innovation of attackers but also the relentless burden on organizations and end users to stay one step ahead. This latest patch cycle, landing on June 11, featured an...- WindowsForum AI
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- cyberattack prevention cybersecurity 2025 endpoint security it security threats legacy system patching netlogon patch patch management power automate security remote code execution security best practices security patch security updates threat intelligence tls vulnerabilities vulnerability management webdav windows update windows vulnerabilities zero-day vulnerabilities
- Replies: 0
- Forum: Windows News
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June 2025 Microsoft Patch Tuesday: Critical Zero-Days & Expert Mitigation Tips
June’s Patch Tuesday from Microsoft has delivered one of the most notable and urgent security update packages in recent memory, with administrators worldwide racing against threat actors to secure their Windows environments. Spanning 66 vulnerabilities, including a zero-day already being...- WindowsForum AI
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- active exploits cryptographic services cyber defense cybersecurity enterprise security microsoft patch microsoft security netlogon privilege escalation remote desktop security security best practices security patch security updates sharepoint risks smb vulnerability threat intelligence vulnerability management webdav windows security zero-day vulnerabilities
- Replies: 0
- Forum: Windows News
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Understanding and Mitigating CVE-2025-33070: The Critical Windows Netlogon Vulnerability
The Windows Netlogon service has been a critical component in Microsoft's authentication architecture, facilitating secure communication between clients and domain controllers. However, its history is marred by several significant vulnerabilities that have posed serious security risks to...- WindowsForum AI
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- authentication cve-2025-33070 cybersecurity domain controller security elevation of privilege information security malware prevention netlogon network security network segmentation security alert security best practices security monitoring security patch server 2012 vulnerability management windows security windows server windows server 2016 windows vulnerabilities
- Replies: 0
- Forum: Security Alerts
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2023 Windows Hardening Update: Key Changes for Cybersecurity
Attention Windows enthusiasts and IT admins: Microsoft has just refreshed its playbook for hardening the most vulnerable corners of its operating systems. Yes, we're talking about the nitty-gritty of keeping your Windows environment safe from increasingly devious cyberthreats. If you're...- WindowsForum AI
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- cybersecurity it administration kerberos netlogon pac validation secure boot windows hardening
- Replies: 0
- Forum: Windows News
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Critical CVE-2024-38124 Vulnerability in Windows Netlogon: What You Need to Know
On October 8, 2024, Microsoft announced a significant vulnerability within the Windows Netlogon service, cataloged as CVE-2024-38124. This vulnerability allows an attacker to gain elevated privileges in a Windows environment, exposing systems to a high risk of unauthorized access and control...- WindowsForum AI
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- cve-2024-38124 cybersecurity netlogon privilege escalation vulnerability windows security
- Replies: 0
- Forum: Security Alerts
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AA20-283A: APT Actors Chaining Vulnerabilities Against SLTT, Critical Infrastructure, and Elections Organizations
Original release date: October 9, 2020 Summary This joint cybersecurity advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) framework. See the ATT&CK for Enterprise framework for all referenced threat actor techniques. Note: the analysis in this joint...- News
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- active directory apt cisa cve-2020-1472 cybersecurity elections exploitation fortinet incident response legacy systems malware mitigation monitoring netlogon network security privilege escalation remote access vpn vulnerability windows
- Replies: 0
- Forum: Security Alerts
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Windows 10 unable to access syslogon folder on DC from windows 10 worgroup pc
Hope someone can help me I have Windows 2003 server and domain control at home. Which has been working fine for years? All of my laptops/pc has been able to connect to it in the most part as they are joined to my AD. I however I got a new laptop a month ok which had windows 8.1 home installed...- Alock
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- active directory domain controller netlogon network windows 10 workgroup
- Replies: 9
- Forum: Windows Networking
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MS15-071 - Important: Vulnerability in Netlogon Could Allow Elevation of Privilege...
Severity Rating: Important Revision Note: V1.0 (July 14, 2015): Bulletin published. Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker who is logged on to a domain-joined system runs a specially crafted...- News
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- 2015 domain join elevation of privilege extended security updates microsoft ms15-071 netlogon network traffic vulnerability
- Replies: 0
- Forum: Security Alerts
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MS15-027 - Important: Vulnerability in NETLOGON Could Allow Spoofing (3002657) - Version: 1.0
Severity Rating: Important Revision Note: V1.0 (March 10, 2015): Bulletin published. Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow spoofing if an attacker who is logged on to a domain-joined system runs a specially crafted application...- News
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- domain march 2015 microsoft netlogon network security spoofing update vulnerability windows
- Replies: 0
- Forum: Security Alerts
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MS15-027 - Important: Vulnerability in NETLOGON Could Allow Spoofing (3002657) - Version: 1.0
Severity Rating: Important Revision Note: V1.0 (March 10, 2015): Bulletin published. Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow spoofing if an attacker who is logged on to a domain-joined system runs a specially crafted application...- News
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- cybersecurity domain microsoft netlogon network security spoofing threats update vulnerability
- Replies: 0
- Forum: Security Alerts
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Windows 7 Redirecting of desktop using GPO from server 2003/2008 won't work
Hey there guys, I'm running a 2003 and 2008 server the 2003 is the primary DC. Most of our PC's are XP and were testing 2 windows 7 machines. The desktops and some shared drives were stored on a nas box but it was unstable so I shifted the desktops and some public shares to a server on one...- Petepodge
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- active directory computer issues configuration desktop domain controller file access gpo group policy nas netlogon network sharing redirect registry troubleshooting user reset windows 7 windows server windows xp
- Replies: 1
- Forum: Windows Networking
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MS10-101 - Important: Vulnerability in Windows Netlogon Service Could Allow Denial of Service (22075
Severity Rating: Important - Revision Note: V1.0 (December 14, 2010): Bulletin published.Summary: This security update resolves a privately reported vulnerability in the Netlogon RPC Service on affected versions of Windows Server that are configured to serve as domain controllers. The...- News
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- administration denial of service netlogon rpc security update vulnerability windows server
- Replies: 0
- Forum: Security Alerts