CVE-2017-8558

highpriority · attend · 56EPSS 0.436 · 99 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

43.6% (99th) EPSS

CVSS 9.3 · high

Is it mine?

7 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on 32-bit versions of 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 does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability".

cvss

Technical severity, 0–10. One row per scoring source.

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.09.3highAV:N/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 10

v3.07.8highCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9

v3.07.8highCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-119USprimary

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-42264Microsoft MsMpEng - mpengine x86 Emulator Heap Corruption in VFS APIfunctional · exploit_db

affected products (7)

Products and version ranges known to be affected.

Microsoft Corporation Microsoft Malware Protection Engine≤ 32-bit versions only of 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.enisa_euvdEU
microsoft endpoint protectionall versionsnvdUScpe:2.3:a:microsoft:endpoint_protection:*:*:*:*:*:*:*:*
microsoft forefront endpoint protectionall versionsnvdUScpe:2.3:a:microsoft:forefront_endpoint_protection:*:*:*:*:*:*:*:*
microsoft forefront endpoint protection= 2010nvdUScpe:2.3:a:microsoft:forefront_endpoint_protection:*:*:*:*:*:*:*:*
microsoft security essentialsall versionsnvdUScpe:2.3:a:microsoft:security_essentials:*:*:*:*:*:*:*:*
microsoft windows defenderall versionsnvdUScpe:2.3:a:microsoft:windows_defender:*:*:*:*:*:*:*:*
microsoft windows intune endpoint protectionall versionsnvdUScpe:2.3:a:microsoft:windows_intune_endpoint_protection:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2017-06-29modified 2026-06-17

related (21,028)

Related entries.

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+21023 more

references (16)

External citations — patches, advisories, analysis.

scry

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