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Microsoft October 2025 Patch Tuesday update (175 CVEs)

Security Patch Release
First reported
Last updated
Happening score
H score 55
2 unique sources, 2 articles

Summary

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Microsoft's October Patch Tuesday release closed 175 CVEs, including two actively exploited zero-days and multiple flaws the company expects attackers to target. The update affects a wide range of Microsoft products, so exposed and unmanaged systems face immediate risk if the fixes are delayed. It is the largest Microsoft Patch Tuesday in recent memory and arrives as Windows 10 reaches end of life for regular security patches.

Related Happenings

Microsoft YellowKey patch release (CVE-2026-45585)

Security Patch Release
H score20 First: 11.06.2026 20:43 Last: 11.06.2026 20:43 Sources 1

About this happening: Microsoft's **Patch Tuesday** updates this week patched **YellowKey (CVE-2026-45585)**, closing a **Windows BitLocker** bypass that could expose protected volumes. The vendor rele...

Open Happening

Microsoft security patch release for CVE-2026-42897

Security Patch Release
H score44 First: 10.06.2026 16:44 Last: 10.06.2026 16:44 Sources 1

About this happening: **Microsoft** released **June 2026 Security Updates** for **Exchange Server 2016**, **Exchange Server 2019**, and **Exchange Server Subscription Edition (SE)** to fix **CVE-2026-4...

Open Happening

Microsoft Windows June 2026 Patch Tuesday zero-day fixes (multiple vulnerabilities)

Security Patch Release
H score40 First: 10.06.2026 12:57 Last: 10.06.2026 12:57 Sources 1

About this happening: **Microsoft**'s **June 2026 Patch Tuesday** fixed **three Windows zero-days** that could yield **SYSTEM** access or bypass **BitLocker** on vulnerable systems.

Open Happening

Microsoft June 2026 Patch Tuesday record 206-vulnerability update

Security Patch Release
H score55 First: 10.06.2026 12:38 Last: 10.06.2026 12:38 Sources 1

About this happening: Microsoft shipped a **record 206-vulnerability** update for its software portfolio, including **three publicly disclosed flaws**. The release spans **Critical** and **Important**...

Open Happening

Microsoft June 2026 Patch Tuesday GreenPlasma and YellowKey fixes

Security Patch Release
H score15 First: 10.06.2026 02:11 Last: 10.06.2026 02:11 Sources 1

About this happening: **Microsoft** released **June 2026 Patch Tuesday** updates that fixed the **GreenPlasma** and **YellowKey** flaws, closing two previously disclosed issues in the Windows ecosystem...

Open Happening

Timeline

  1. 15.10.2025 00:53 3 articles · 8mo ago

    Microsoft October 2025 Patch Tuesday release

    Initial Disclosure

    Microsoft's October 2025 Patch Tuesday security update delivered 175 CVEs across Windows and other products, including CVE-2025-59230 and CVE-2025-24990, two zero-days already being actively exploited, plus three previously disclosed issues and more than a dozen flaws Microsoft considers likely exploitation targets.

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  2. 15.10.2025 00:53 1 articles · 8mo ago

    Active exploitation of Windows and IGEL OS zero-days

    Exploitation Observed

    Attackers were already exploiting CVE-2025-59230 in Windows Remote Access Connection Manager and CVE-2025-24990 in the Windows Agere modem driver, while CVE-2025-47827 in IGEL OS had a public proof of concept since May and was also described as actively exploitable.

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  3. 15.10.2025 00:53 1 articles · 8mo ago

    Microsoft removes the Agere modem driver

    Mitigation Patch Update

    Microsoft removed the Windows Agere modem driver ltmdm64.sys through the October cumulative update to block the exploitation path tied to the modem-service flaws, and Microsoft advised removing existing dependencies on that hardware because Agere modems using the driver would no longer work on Windows.

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  4. 15.10.2025 00:53 1 articles · 8mo ago

    Windows 10 reaches end of regular patching

    Legal Policy Action Update

    The October Patch Tuesday cycle marked Windows 10 end of life for regular security patches, meaning Microsoft will no longer issue routine Patch Tuesday fixes for the operating system even though it still holds a large share of the desktop Windows market.

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