CVE-2017-8656: Microsoft Edge scripting engine memory corruption allows code execution

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 19 September 2026. Confidence: medium.

high priorityCVSS 7.5 with high EPSS and a public exploit raise the risk, though exploitation requires user interaction and no KEV listing is present.

What it is

Microsoft Edge's JavaScript engine mishandles objects in memory, causing a memory corruption condition (CWE-119) when rendering content. A remote attacker who convinces a user to view crafted content can run arbitrary code in that user's context. The flaw affects Edge on Windows 10 1607, 1703, and Windows Server 2016.

Impact

Successful exploitation gives the attacker code execution with the privileges of the current user, enabling data theft, installation of malware, or further compromise of the host.

Attack surface

Reached over the network through crafted web content rendered by the Edge JavaScript engine; no authentication is required, but user interaction is needed per the CVSS vector (UI:R), meaning the victim must open or view the malicious page.

Exploitation

Not listed in CISA KEV, but EPSS is high (0.69277, 99.3rd percentile) and a public Exploit-DB entry (42464) exists, indicating exploit code is available.

What to do

• Apply the Microsoft security update referenced in the vendor advisory (portal.msrc.microsoft.com advisory CVE-2017-8656) as the first action.
• Upgrade affected Windows 10 1607/1703 and Windows Server 2016 systems to a supported build that includes the fix.
• Restrict or disable Microsoft Edge where it is not required, and enforce a modern supported browser.
• Block known exploit hosts and untrusted script sources at the network and email gateway layers.
• Enable exploit protection features such as Control Flow Guard and mitigations for browser processes.

Detection

• Monitor for Edge (MicrosoftEdge.exe) crashes or abnormal child processes spawned from browser processes.
• Alert on suspicious process creation where a browser process is the parent, especially scripting or command interpreters.
• Review proxy and DNS logs for requests to known exploit or malicious content hosts tied to this campaign.
• Correlate endpoint telemetry for memory corruption indicators and unexpected code execution in browser context.

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