THREATPORT/VULNERABILITY/CVE-2017-8539
MEDIUM SEVERITY

CVE-2017-8539

Forefront Security vulnerability

CVSS
5.5
EPSS
6.0%
EPSS pct
93th
Exploited
No known
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.
Affected vendor
Microsoft
Affected product
Forefront Security
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-119 — Improper Restriction of Operations within Memory Bounds
  • CWE-369 — Divide By Zero
  • CWE-476 — NULL Pointer Dereference
  • CWE-674 — Uncontrolled Recursion
Published
2017-05-26

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 6.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.

Check your external exposure to CVE-2017-8539

  • Confirm whether Microsoft Forefront Security is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2017-8539.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-8539

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-8539 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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