http.sys

Microsoft’s advisory listing for a Windows HTTP.sys elevation-of-privilege flaw should be treated as a high-priority remediation item: the vulnerability is recorded in vendor telemetry and public trackers, it affects the kernel-mode HTTP protocol stack that terminates HTTP requests for IIS and...

Microsoft has formally acknowledged that several high‑visibility Windows 11 UI behaviors — previously tracked against the 24H2 servicing branch — are also affecting some devices running the 25H2 branch, with Microsoft publishing Known Issue guidance and temporary mitigations after widespread...

Microsoft’s November Patch Tuesday rollup for Windows 11 version 23H2 — released as KB5068865 and moving affected devices to OS Build 22621.6199 — delivers a mix of security and quality fixes, and one networking change that deserves close attention from administrators: a tightened parsing rule...

Microsoft’s November 11, 2025 cumulative update for Windows 11 — KB5068865 (OS Build 22631.6199) — closes a subtle but important standards-compliance gap in the Windows HTTP stack (HTTP.sys), aligning chunked-transfer parsing with RFC 9112 and giving administrators an explicit registry toggle to...

Microsoft has acknowledged a serious regression in its October 14, 2025 cumulative update for Windows 11 (KB5066835) and is rolling an emergency fix after the patch broke two very different but critical areas of the platform: local HTTP/2 (localhost) connections used by developers and many...

Microsoft’s October cumulative update for Windows 11 (KB5066835) created an urgent problem for many users and IT teams by rendering the Windows Recovery Environment (WinRE) non‑interactive: after installing the update, USB keyboards and mice stopped responding inside WinRE while continuing to...

Lian Li owners reporting a disappearing L‑Connect 3 UI after Patch Tuesday’s October cumulative (KB5066835) now have a practical — if temporary — workaround: pause Windows Update, remove KB5066835, and reboot. Background / Overview Microsoft shipped the October 14, 2025 cumulative update for...

Microsoft has confirmed that October’s Patch Tuesday cumulative updates for Windows 11 — notably the October 14, 2025 packages that include KB5066835 (and earlier preview releases such as KB5065789) — have caused a regression in the Windows HTTP stack (HTTP.sys) that can break IIS-hosted sites...

Microsoft’s October cumulative update for Windows 11 (KB5066835) introduced a high-impact regression that broke localhost-based web services for many developers and some production desktop applications, forcing dozens of teams to apply emergency mitigations or roll back the update entirely to...

A wide-ranging October 2025 cumulative update for Windows 11 (KB5066835), and at least one related preview package, has broken many local IIS-hosted sites and developer workflows — causing ERR_CONNECTION_RESET, ERR_HTTP2_PROTOCOL_ERROR and outright failure of localhost-based services for...

When a Windows Server hosts services for users or other systems, port visibility is one of the first and most essential things an administrator must master; knowing which ports are listening, which are established, and which are blocked by a firewall directly affects uptime, security posture...

Microsoft’s advisory for a newly referenced HTTP.sys vulnerability describes an out‑of‑bounds read in the Windows HTTP protocol stack that can be triggered remotely against Internet Information Services (IIS) and other HTTP.sys consumers, allowing an unauthenticated attacker to cause a...

Windows developers and administrators who depend on client-certificate (mTLS) workflows will need to keep using workarounds: a structural limitation introduced by TLS 1.3 and the way Windows handles TLS in kernel (http.sys / Schannel) means IIS Express on Windows 11 cannot reliably request a...

Microsoft’s Internet Information Services (IIS) and its relationship with Windows Server have resurfaced in recent reporting as a nexus of operational pain and security risk — a story that blends a high‑volume patch cycle, at least one serious authentication vulnerability, and persistent...

Windows users and IT professionals—prepare to dive into the intricacies of a fresh challenge in the cybersecurity landscape. CVE-2025-27473, a denial-of-service vulnerability discovered in the Windows HTTP.sys driver, exposes a path for attackers to trigger uncontrolled resource consumption...

Severity Rating: Critical Revision Note: V1.0 (April 14, 2015): Bulletin published. Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker sends a specially crafted HTTP request to an affected Windows...

Severity Rating: Critical Revision Note: V1.0 (April 14, 2015): Bulletin published. Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker sends a specially crafted HTTP request to an affected Windows...

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Severity Rating: Important Revision Note: (May 14, 2013): Bulletin published. Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow denial of service if an attacker sends a specially crafted HTTP packet...

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