Malware Protection Engine vulnerabilitiesAnd the versions its exploited flaws hit.
Malware Protection Engine is made by Microsoft. We track 25 published vulnerabilities in it, across 52 versions. 2 of them are on the list of flaws known to be exploited, the newest added on 20 May 2026. If you run Malware Protection Engine, check your version against the exploited flaws below and patch those first.
The most recent Malware Protection Engine flaw added to the known-exploited list is CVE-2026-41091, on 20 May 2026. We keep watching the known-exploited list.
Which versions of Malware Protection Engine do the exploited flaws hit?
Each exploited flaw lists the versions it affects, usually as ranges. "1.1.26030.3008 to before 1.1.26040.8" means from 1.1.26030.3008 up to, but not including, 1.1.26040.8. Find your version, then patch.
- CVE-2026-41091Exploited list, 20 May 2026
Microsoft Defender Link Following Vulnerability
1.1.26030.3008 to before 1.1.26040.8 - CVE-2017-8540Exploited list, 3 Mar 2022
Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
1.1.13701.0 to before 1.1.13704.0
Which Malware Protection Engine vulnerabilities are being exploited?
2 flaws are on the government list of vulnerabilities known to be exploited. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 7.8Microsoft Defender Link Following Vulnerability
Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.
- 7.8Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
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...
Which Malware Protection Engine flaws are most likely to be used?
Ranked by the latest exploit-likelihood forecast: the chance each flaw is used in an attack in the next 30 days. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- 81%CVE-2017-0290High
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...
- 30%CVE-2006-5270Critical
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...
- 28%CVE-2017-11937High
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,...
- 20%CVE-2017-11940High
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,...
- 13%CVE-2014-2779Medium
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.
- 13%CVE-2008-1438Medium
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...
- 13%CVE-2008-1437Medium
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...
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1 flaw being exploited affects software Acme tracks
Microsoft Defender contains a link following vulnerability that allows an authorized attacker to elevate privileges locally.
- Matched to
- Malware Protection Engine on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
We track 25 published vulnerabilities listed under the name Malware Protection Engine, across 52 versions. The most recent Malware Protection Engine flaw added to the known-exploited list is CVE-2026-41091, on 20 May 2026.
2 are on the list of flaws known to be exploited. The most recently added are CVE-2026-41091 and CVE-2017-8540.
Each flaw names its own versions, usually as ranges. The newest, CVE-2026-41091, affects 1.1.26030.3008 to before 1.1.26040.8. The versions for every exploited flaw are listed on this page.
Create a Precursor Intelligence account and track Malware Protection Engine. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.