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CVE-2017-8539

22
FAUCET Score

CVE-2017-8539 is a Denial of Service vulnerability in the Microsoft Malware Protection Engine, affecting various versions of Microsoft Windows, Windows Server, and Exchange Server. The vulnerability allows an attacker to cause a denial of service by providing a specially crafted file that the engine fails to properly scan. With a CVSS score of 5.5 (MEDIUM), this vulnerability requires user interaction (UI:R) and local access (AV:L) to exploit, leading to high availability impact (A:H) but no confidentiality or integrity impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV catalog inclusion, though it has received some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:forefront_security:-:*:*:*:*:*:*:*
<= 1.1.13704.0CPE matchmatch criteria
cpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.02%
Probability of exploitation in next 30 days
EPSS Percentile
92.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0602 is in the 98th percentile among its peer group of 5,758 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

microsoftvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

microsoft2017-May/CVE-2017-8539Important

Microsoft Malware Protection Engine Denial of Service Vulnerability

May 9, 2017

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2017-8539
Vendor Advisory
securityfocus.com / bid/98704
Third Party AdvisoryVDB Entry
securitytracker.com / id/1038571