Researcher Drops BigDiskBuster Zero-Day PoC That Blocks Microsoft Defender Updates

A zero-day proof-of-concept tool that stops Microsoft Defender from installing platform and signature updates by filling all available disk space was published on GitHub on September 19. The tool, called BigDiskBuster , has no patch, no CVE, and no Microsoft advisory. Its author, Abdelhamid Nacer...

BigDiskBuster

BigDiskBuster Windows Defender Update Denial of Service Vulnerability This proof of concept is similar to UnDefend, it prevents windows defender from performing platform/signature updates, Seems to work on all supported windows versions but PoC is a bit buggy and needs some rewritting but you get...

Microsoft Windows Defender DoS

The vulnerability of Microsoft Windows Defender operating systems is related to an uncontrolled consumption of resources. Exploiting this vulnerability can allow a hacker to cause service interruptions...

ShieldBreak

ShieldBreak - Windows Defender 0day 脆弱性 Microsoft は RoguePlanet 脆弱性 CVE-2026-50656 の適切なパッチ適用に失敗しており、この PoC は完全なパッチバイパスを実証しています。 この PoC は、最新バージョンの Windows 11 25H2 +Canary チャネル と Windows Server 2025 でテストされており、成功率は 100% です。 なお、Windows 10 および対応するサーバーエディション は現在サポートされていませんが、ShieldBreak...

PT-2026-97631

Уязвимость Защитника Microsoft Windows Defender операционных систем Windows связана с неконтролируемым расходом ресурсов. Эксплуатация уязвимости может позволить нарушителю вызвать отказ в обслуживании...

Improving email security outcomes with real-world Microsoft Defender insights

Every benchmark tells a story. The most valuable ones tell us where to improve next. For five consecutive quarters Microsoft has published email security benchmarking reports to provide greater transparency into real-world protection outcomes. The results have shown strong Microsoft Defender...

ShieldCrash

ShieldCrash Vulnerabilidad 0day de Windows Defender Microsoft no ha logrado parchear correctamente ShieldBreak CVE-2026-69414; bajo condiciones específicas, todavía es posible desencadenar exactamente el mismo problema que causó ShieldBreak. Aunque Microsoft corrigió varias cosas para evitar...

Detect and disrupt AI-themed attacks with Microsoft Defender

Every wave of technology excitement creates a new opportunity for cyberattackers, and AI is no exception. Microsoft Threat Intelligence has published research showing a growing set of campaigns that impersonate popular AI platforms and tools, including ChatGPT, Microsoft Copilot, DeepSeek, and...

Microsoft Malware Protection Engine Unauthorized Access

The vulnerability of the Microsoft Malware Protection Engine, a component of the Microsoft Defender antivirus protection tool, relates to an improper definition of symbolic links before accessing a file. Exploiting this vulnerability could allow an attacker to gain unauthorized access to protecte...

Researcher Drops New Microsoft Defender PoC Showing ShieldBreak Patch Can Be Bypassed

The security researcher known as Chaotic Eclipse has dropped a proof-of-concept PoC for yet another zero-day in Microsoft Defender. The vulnerability, codenamed ShieldCrash , is assessed to be a patch bypass for CVE-2026-69414 CVSS score: 7.8, also called ShieldBreak, which the researcher reporte...

CVE-2026-70568

Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally...

CVE-2026-68831

Files or directories accessible to external parties in Windows Defender Firewall Service allows an authorized attacker to disclose information locally...

CVE-2026-70568

This is a heap-based buffer overflow vulnerability in Windows Defender Firewall Service that allows an authorized attacker to achieve local privilege escalation with high impact on confidentiality, integrity, and availability. The CVSS 3.1 score is 7.0 (HIGH) , reflecting a local attack vector wi...

EUVD-2026-73648

Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally...

CVE-2026-68831

CVE-2026-68831 is an information disclosure vulnerability in Windows Defender Firewall Service . The issue arises from files or directories accessible to external parties, allowing an authorized attacker with low privileges to disclose information locally (CVSS 3.1 score 5.5 – MEDIUM ; vector AV:...

EUVD-2026-73398

Files or directories accessible to external parties in Windows Defender Firewall Service allows an authorized attacker to disclose information locally...

Windows Defender Firewall Service Information Disclosure Vulnerability

Files or directories accessible to external parties in Windows Defender Firewall Service allows an authorized attacker to disclose information locally...

Windows Defender Firewall Service Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally...

CVE-2026-70568: Heap-based Buffer Overflow

Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally...

PT-2026-87805

Name of the Vulnerable Software and Affected Versions Windows Defender Firewall Service affected versions not specified Description A heap-based buffer overflow occurs in the Windows Defender Firewall Service. This issue allows an authorized attacker to elevate privileges locally on the system. A...