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Vulnerability record · CVE-2017-8558 · published 29 June 2017

CVE-2017-8558: Microsoft windows defender memory buffer overflow vulnerability

Microsoft · Windows Defender

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".

7.8 CVSS 3.0 High EPSS 44% · top 1.3% CWE-119 · Memory buffer overflow
7.8CVSS 3.0 base score, v2 9.3
44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

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:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/99262 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038783 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038784 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8558 Vendor Advisory
https://www.exploit-db.com/exploits/42264/ Third Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/99262 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038783 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1038784 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8558 Vendor Advisory
https://www.exploit-db.com/exploits/42264/ Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2021-1647Microsoft Defender Remote Code Execution VulnerabilityCVE-2021-1647 is a remote code execution flaw in Microsoft Defender, the built-in antivirus and endpoint protection component of Windows, as well as …KEVEPSS 39%analysed7.8CVE-2017-8540Microsoft Malware Protection Engine out-of-bounds write via crafted fileThe Microsoft Malware Protection Engine, used by Windows Defender, Forefront, Security Essentials, System Center Endpoint Protection, Intune Endpoint…KEVEPSS 72%analysed9.3CVE-2006-5270Microsoft antigen vulnerabilityInteger overflow in the Microsoft Malware Protection Engine (mpengine.dll), as used by Windows Live OneCare, Antigen, Defender, and Forefront Securit…EPSS 30%8.8CVE-2018-0986Microsoft Malware Protection Engine out-of-bounds write enables remote code executionThe Microsoft Malware Protection Engine mishandles a specially crafted file during scanning, causing an out-of-bounds write and memory corruption. Be…EPSS 63%analysed7.8CVE-2023-36422Microsoft windows defender untrusted search path vulnerabilityMicrosoft Windows Defender Elevation of Privilege VulnerabilityEPSS 0.81%7.8CVE-2023-38175Microsoft windows defender link following vulnerabilityMicrosoft Windows Defender Elevation of Privilege VulnerabilityEPSS 0.54%7.8CVE-2021-24092Microsoft windows defender improper privilege management vulnerabilityMicrosoft Defender Elevation of Privilege VulnerabilityEPSS 0.61%7.8CVE-2020-1163Microsoft windows defender vulnerabilityAn elevation of privilege vulnerability exists in Windows Defender that leads arbitrary file deletion on the system.To exploit the vulnerability, an …EPSS 0.89%

Source: NIST National Vulnerability Database (record CVE-2017-8558), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.