CVE-2017-8540: Microsoft Malware Protection Engine Improper Restriction of Operations Vulnerability
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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 memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability".
CSIRTS triage
- What
- The Microsoft Malware Protection Engine does not properly scan a specially crafted file leading to memory corruption.
- Who is affected
- Users of the specified Microsoft products are affected.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Update the Microsoft Malware Protection Engine to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2017-8540
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2017-8540Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2017-8540 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Microsoft Malware Protection
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [high] Microsoft Malware Protection Engine: Vulnerability allows privilege escalationcert-bund · 2026-07-10
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