CVE-2017-8558

Exp

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".

Published: 2017-06-29 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-8558 is rated High Exploit Risk (85.5/100): CVSS High severity, with high exploitation likelihood (EPSS 57.85%, 98th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +8.15% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-8558

EDB-ID Source Kind Published Link
42264 exploit_db edb 2017-06-27 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-8558

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 49.69% 57.85% +8.15%
2 2025-11-18 57.85% 49.69% -8.15%
3 2025-10-19 — 57.85% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-8558

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2017-8558

Affected software / configurations for CVE-2017-8558

Vendor Product Version Raw CPE
microsoft windows_defender — cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:*
microsoft endpoint_protection — cpe:2.3:a:microsoft:endpoint_protection:-:*:*:*:*:*:*:*
microsoft forefront_endpoint_protection — cpe:2.3:a:microsoft:forefront_endpoint_protection:-:*:*:*:*:*:*:*
microsoft forefront_endpoint_protection 2010 cpe:2.3:a:microsoft:forefront_endpoint_protection:2010:*:*:*:*:*:*:*
microsoft security_essentials — cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:*
microsoft windows_intune_endpoint_protection — cpe:2.3:a:microsoft:windows_intune_endpoint_protection:-:*:*:*:*:*:*:*

References for CVE-2017-8558

cvelogic Threat Intelligence