CVE-2017-8594: Internet Explorer memory corruption allows remote code execution

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 20 September 2026. Confidence: medium.

high priorityCVSS 3.0 scores 7.5 (HIGH) with full confidentiality, integrity and availability impact, a public exploit exists, and EPSS is near the top percentile, though exploitation requires user interaction and the affected platforms are aging.

What it is

Internet Explorer on Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 improperly accesses objects in memory, causing a memory corruption condition (CWE-119). A remote attacker can exploit this to run arbitrary code in the context of the current user, which matters because IE was a widely used browser on those platforms and the flaw gives code execution rather than just a crash.

Impact

An attacker who successfully triggers the flaw gains arbitrary code execution with the privileges of the logged-in user, enabling installation of malware, data theft or further compromise of the host.

Attack surface

The vulnerability is reached over the network (AV:N) through crafted web content rendered by Internet Explorer; no authentication is required (PR:N) but the victim must interact, typically by visiting a malicious or compromised page (UI:R).

Exploitation

CISA KEV does not list this CVE, but an Exploit-DB entry (42336) tagged as an exploit exists and EPSS gives a 30-day probability of about 0.50 (98.9th percentile), indicating meaningful real-world exploitation likelihood.

What to do

• Apply the Microsoft security update referenced in the MSRC advisory for CVE-2017-8594 on all affected Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 systems.
• Retire or migrate off Internet Explorer on these platforms; use a supported modern browser for all web access.
• Enforce Enhanced Protected Mode / Enhanced Security Configuration and disable unnecessary IE add-ons and ActiveX where IE must remain.
• Block or filter untrusted web content at the network perimeter and restrict outbound browsing from servers.
• Monitor for and remove unsupported Windows 8.1/RT 8.1/Server 2012 R2 endpoints that cannot be patched.

Detection

• Hunt for IE (iexplore.exe) spawning child processes such as cmd.exe, powershell.exe or script hosts, which is abnormal for normal browsing.
• Review endpoint telemetry for IE crashes or memory-corruption-related faulting events followed by suspicious process creation on affected OS versions.
• Search proxy and DNS logs for access to known exploit-hosting or malvertising domains tied to IE exploit kits.
• Alert on exploit-db or public PoC signatures matching CVE-2017-8594 in IDS/IPS and endpoint detection rules.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.