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CVE-2026-122194

Microsoft Defender Remote Code Execution Vulnerability

Null pointer dereference in Microsoft Defender allows an unauthorized attacker to execute code over a network.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
CVE-2026-69414

Microsoft Defender Elevation of Privilege Vulnerability

Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as &quot;ShieldBreak &quot;.

CVSS 3.1 · 7.8 High EPSS 1.4% KEV · Not listed
Vendors
CVE-2026-50656

Microsoft Defender Elevation of Privilege Vulnerability

Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as &quot;RoguePlanet &quot;.

CVSS 3.1 · 7.8 High EPSS 11.2% KEV · Not listed
Vendors
CVE-2026-55012

Microsoft Defender Remote Code Execution Vulnerability

Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
CVE-2026-55011

Microsoft Defender Remote Code Execution Vulnerability

Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
CVE-2026-41091

Microsoft Defender Elevation of Privilege Vulnerability

Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to elevate privileges locally.

CVSS 3.1 · 7.8 High EPSS 8.2% KEV · Listed
Vendors
CVE-2026-45584

Microsoft Defender Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
CVE-2006-5270

Integer overflow in the Microsoft Malware Protection Engine (mpengine.dll), as used by Windows Live OneCare, Antigen, Defender, and Forefront Security, allows user-assisted remote attackers to execute arbitrary code via a crafted PDF file.

CVSS 2.0 · 9.3 Critical EPSS 30.5% KEV · Not listed
Vendors
CVE-2008-1437

Unspecified vulnerability in Microsoft Malware Protection Engine (mpengine.dll) 1.1.3520.0 and 0.1.13.192, as used in multiple Microsoft products, allows context-dependent attackers to cause a denial of service (engine hang and restart) via a crafted file, a different vulnerability than CVE-2008-1438.

CVSS 2.0 · 5.0 Medium EPSS 12.9% KEV · Not listed
Vendors
CVE-2008-1438

Unspecified vulnerability in Microsoft Malware Protection Engine (mpengine.dll) 1.1.3520.0 and 0.1.13.192, as used in multiple Microsoft products, allows context-dependent attackers to cause a denial of service (disk space exhaustion) via a file with "crafted data structures" that trigger the creation of large temporary files, a different vulnerability than CVE-2008-1437.

CVSS 2.0 · 5.0 Medium EPSS 12.9% KEV · Not listed
Vendors
CVE-2017-8540

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability", a different vulnerability than CVE-2017-8538 and CVE-2017-8541.

CVSS 3.1 · 7.8 High EPSS 71.9% KEV · Listed
Vendors
CVE-2017-0290

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 does not properly scan a specially crafted file leading to memory corruption, aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability."

CVSS 3.0 · 7.8 High EPSS 81.4% KEV · Not listed
Vendors
CVE-2017-11937

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Windows 7 SP1, Windows 8.1, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, 1709 and Windows Server 2016, Windows Server, version 1709, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to remote code execution. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability".

CVSS 3.0 · 7.8 High EPSS 28.3% KEV · Not listed
Vendors
CVE-2017-11940

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Windows 7 SP1, Windows 8.1, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, 1709 and Windows Server 2016, Windows Server, version 1709, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to remote code execution. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability". This is different than CVE-2017-11937.

CVSS 3.0 · 7.8 High EPSS 20.5% KEV · Not listed
Vendors
CVE-2017-8538

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability", a different vulnerability than CVE-2017-8540 and CVE-2017-8541.

CVSS 3.0 · 7.8 High EPSS 50.0% KEV · Not listed
Vendors