CVE-2017-8558
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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 43.6%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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
- 7.8 HIGHCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 43.59% probability · 99th percentile
- Public exploits
- 1 in Exploit-DB · verified · first 27 June 2017
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- microsoft/windows defender · microsoft/endpoint protection · microsoft/forefront endpoint protection · microsoft/security essentials · microsoft/windows intune endpoint protection
- Source
- secure@microsoft.com
EPSS 43.6% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://www.securityfocus.com/bid/99262Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038783Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038784Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8558Vendor Advisory
- https://www.exploit-db.com/exploits/42264/Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/99262Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038783Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038784Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8558Vendor Advisory
- https://www.exploit-db.com/exploits/42264/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.