VulnerabilityModified

CVE-2017-8539

MEDIUM 5.5EPSS 6.02%

Does this matter?

Lower severity and a low EPSS score (6.02%). Track it; it rarely justifies an emergency change on its own.

Description

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 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016, does not properly scan a specially crafted file leading to denial of service. aka "Microsoft Malware Protection Engine Denial of Service Vulnerability", a different vulnerability than CVE-2017-8535, CVE-2017-8536, CVE-2017-8537, and CVE-2017-8542.

CVSS 3.0: 5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS: 6.02% probability · 93th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-119, CWE-369, CWE-476, CWE-674
Affected: microsoft/forefront security · microsoft/malware protection engine · microsoft/windows defender
Source: secure@microsoft.com

EPSS trend

EPSS 6.0% 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.

References

http://www.securityfocus.com/bid/98704Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038571
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8539Vendor Advisory
http://www.securityfocus.com/bid/98704Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038571
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8539Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.