MP
Product
Malware Protection Engine
by Microsoft · last CVE Aug 14, 2026
On CISA KEVExploited in the wild
31
CVEs
2
On KEV
8.1
Max CVSS
0
New 30D
Severity mix
Critical 0High 20Medium 5Low 0
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CVECVSSEPSSPublishedSummary · affected versions
CVE-2026-41091
In wildKEV
7.8
8%
May 20
Microsoft Defender Elevation of Privilege Vulnerability
Affected: 1.1.26030.3008 before 1.1.26040.8
CVE-2017-8540
In wildKEV
7.8
72%
May 26
Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
Affected: 1.1.13701.0 before 1.1.13704.0
CVE-2026-45584
8.1
1%
May 20
Microsoft Defender Remote Code Execution Vulnerability
Affected: 1.1.26030.3008 before 1.1.26040.8
CVE-2026-69414
7.8
1%
Aug 14
Microsoft Defender Elevation of Privilege Vulnerability
Affected: All versions, or not specified
CVE-2026-55012
7.8
0%
Jul 14
Microsoft Defender Remote Code Execution Vulnerability
Affected: before 1.1.26060.3008
CVE-2026-55011
7.8
0%
Jul 14
Microsoft Defender Remote Code Execution Vulnerability
Affected: before 1.1.26060.3008
CVE-2021-42298
7.8
6%
Nov 10
Microsoft Defender Remote Code Execution Vulnerability
Affected: before 1.1.18700.3
CVE-2021-34471
7.8
1%
Aug 12
Microsoft Defender Elevation of Privilege Vulnerability
Affected: before 1.1.18400.4
CVE-2021-34464
7.8
3%
Jul 16
Microsoft Defender Remote Code Execution Vulnerability
Affected: All versions, or not specified
CVE-2021-34522
7.8
3%
Jul 14
Microsoft Defender Remote Code Execution Vulnerability
Affected: before 1.1.18242.0
CVE-2021-31985
7.8
8%
Jun 8
Microsoft Defender Remote Code Execution Vulnerability
Affected: before 1.1.18200.3
CVE-2017-11940
7.8
21%
Dec 8
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,…
Affected: through 1.1.14306.0
CVE-2017-11937
7.8
28%
Dec 7
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,…
Affected: through 1.1.14306.0
CVE-2017-8541
7.8
48%
May 26
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…
Affected: through 1.1.13704.0
CVE-2017-8538
7.8
50%
May 26
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…
Affected: through 1.1.13704.0
CVE-2017-0290
7.8
81%
May 9
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…
Affected: through 1.1.13701.0
CVE-2023-24860
7.5
3%
Apr 11
Microsoft Defender Denial of Service Vulnerability
Affected: before 1.1.20200.4
CVE-2022-37971
7.1
1%
Oct 11
Microsoft Windows Defender Elevation of Privilege Vulnerability
Affected: before 1.1.19700.2
CVE-2026-50656
7.0
11%
Jun 16
Microsoft Defender Elevation of Privilege Vulnerability
Affected: All versions, or not specified
CVE-2023-33156
7.0
0%
Jul 11
Microsoft Defender Elevation of Privilege Vulnerability
Affected: before 1.1.23050.3
CVE-2023-23389
6.3
0%
Mar 14
Microsoft Defender Elevation of Privilege Vulnerability
Affected: 1.1.20000.2
CVE-2022-24548
5.5
3%
Apr 15
Microsoft Defender Denial of Service Vulnerability
Affected: before 1.1.19100.5
CVE-2021-31978
5.5
1%
Jun 8
Microsoft Defender Denial of Service Vulnerability
Affected: before 1.1.18200.3
CVE-2017-8542
5.5
6%
May 26
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…
Affected: through 1.1.13704.0
CVE-2017-8539
5.5
6%
May 26
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…
Affected: through 1.1.13704.0
CVE-2014-2779
–
13%
Jun 18
mpengine.dll in Microsoft Malware Protection Engine before 1.1.10701.0 allows remote attackers to cause a denial of service (system hang) via a crafted file
Affected: through 1.1.10600.0
CVE-2013-1346
–
12%
May 15
mpengine.dll in Microsoft Malware Protection Engine before 1.1.9506.0 on x64 platforms allows remote attackers to execute arbitrary code or cause a denial of service (memory…
Affected: through 1.1.9402.0
CVE-2011-0037
–
2%
Feb 25
Microsoft Malware Protection Engine before 1.1.6603.0, as used in Microsoft Malicious Software Removal Tool (MSRT), Windows Defender, Security Essentials, Forefront Client…
Affected: through 1.1.6502.0; 0.1.13.192; 1.1.3520.0
CVE-2008-1438
–
13%
May 13
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…
Affected: 0.1.13.192; 1.1.3520.0
CVE-2008-1437
–
13%
May 13
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…
Affected: 0.1.13.192; 1.1.3520.0
CVE-2006-5270
–
30%
Feb 13
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…
Affected: All versions, or not specified
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