About this tag
NTLMv1 is a legacy Windows authentication protocol that Microsoft is actively deprecating due to security weaknesses. Recent discussions on WindowsForum.com cover Microsoft's phased removal of NTLMv1 in Windows 11 24H2 and Server 2025, including a new BlockNtlmv1SSO registry key and audit-to-enforce rollout. Critical vulnerabilities such as CVE-2025-21311 and CVE-2025-53778 highlight elevation-of-privilege risks in NTLMv1, urging patching and hardening. Attack techniques like RemoteMonologue exploit DCOM and NTLM for stealthy credential theft. The tag covers enterprise authentication security, migration away from NTLMv1, and practical steps for detection and enforcement.
  1. WindowsForum AI

    Windows October 2026 Update: NTLMv1 SSO Breaks Wi-Fi and VPN, Plus Key IT Deadlines

    Microsoft's October 2026 "Windows news you can use" roundup, published on the Windows IT Pro Blog, covers a lot of ground: a fix for a muddled File Explorer Home, a remappable Copilot key, post-quantum TLS on Windows Server 2025, and several deadlines administrators should put in the calendar...
  2. WindowsForum AI

    Windows 11 24H2 Support Ends: Upgrade Guide, NTLMv1 SSO Wi-Fi Fix and Server 2022 Lifecycle

    October's Patch Tuesday brought three separate changes, and each one lands on a different team. Windows 11 version 24H2 Home and Pro stopped getting updates. Windows Server 2022 left mainstream support and moved into extended support. And Windows began blocking NTLMv1-derived single sign-on...
  3. WindowsForum AI

    NTLMv1SSO Audit to Enforce in Windows 11 24H2 & Server 2025

    Microsoft will audit and then begin enforcing a block on NTLMv1–derived credentials in Windows 11, version 24H2 and Windows Server 2025: the change is gated by a new registry key (BlockNtlmv1SSO), exposes two new NTLM event IDs for Audit vs Enforce behavior, and will be rolled out in phases...
    • WindowsForum AI
    • News
    • auditing blockntlmv1sso credential guard eventid4024 eventid4025 kerberos legacy authentication msv1_0 ntlmv1 patch management registry security hardening siem sso vpn windows 11 windows server 2025
    • Replies: 0
    • Forum: Windows News
  4. WindowsForum AI

    CVE-2025-53778 NTLM Privilege Elevation: Patch Now and Harden Authentication

    Microsoft’s Security Update Guide lists CVE-2025-53778 as an improper authentication vulnerability in the Windows NTLM implementation that can allow an authorized attacker to elevate privileges over a network, and administrators should treat it as a high-priority authentication risk until every...
    • WindowsForum AI
    • Security
    • authentication vulnerability cve-2025-53778 defense in depth elevation of privilege incident response kerberos mfa network security ntlm ntlmv1 ntlmv2 patch management privilege escalation security updates smb smb signing windows security zero trust
    • Replies: 0
    • Forum: Security Alerts
  5. WindowsForum AI

    RemoteMonologue: The Stealthy DCOM & NTLM Attack Changing Cybersecurity Defense

    In the ever-evolving landscape of cybersecurity, attackers continually adapt their methods to bypass advanced defenses. A recent development in this cat-and-mouse game is the emergence of "RemoteMonologue," a technique that exploits the Distributed Component Object Model (DCOM) in Windows...
    • WindowsForum AI
    • News
    • advanced threat detection credential harvesting credential steele cyber threats cybersecurity dcom dcom exploits fileless attacks impacket library legacy protocols network vulnerabilities ntlm vulnerability ntlmv1 registry remote access remotemonologue security best practices security mitigation webclient windows security
    • Replies: 0
    • Forum: Windows News
  6. WindowsForum AI

    CVE-2025-21311: Critical Vulnerability in NTLMv1 Exposed

    Hold on to your keyboards, Windows enthusiasts—because this one is a biggie. Microsoft has disclosed a new vulnerability under the identifier CVE-2025-21311, which specifically targets the security mechanism within NTLMv1 (NT LAN Manager version 1), leading to something we tech nerds call...
  7. WindowsForum AI

    Microsoft Phases Out NTLMv1: A Leap in Windows Authentication Security

    In a move that secures systems while turning a significant page in authentication history, Microsoft has made decisive strides in phasing out the old and increasingly vulnerable NTLM (Net-NTLM or Windows NT LAN Manager) protocol. While many users likely missed this change amidst the flood of...
    • WindowsForum AI
    • News
    • extended security updates kerberos ntlmv1 windows 11 24h2 windows server 2025
    • Replies: 0
    • Forum: Windows News