CVE-2017-8660

Exploitation likely. EPSS gives it a 10% chance of exploitation in the next 30 days. A vendor fix is available.

CVSS 3.08.8High EPSS percentile96th10% chance in 30 days CISA KEVNot listedNo confirmed exploitation
No public exploit known FixVendor fixNo build named by the sources

Published 2017-09-13Updated 2026-05-13Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

The vendor has published a fix. Version details are below where the sources state them.

Microsoft Corporation Microsoft EdgeAffected: Microsoft Windows 10 1511, 1607, 1703, and Windows Server 2016.Upgrade to: not statedStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Steps

Written by AI from the record

Check whether any computers run the listed Windows versions and use Microsoft Edge.
Install all applicable Microsoft security updates using the vendor advisory; the findings do not provide a single fixed version number.
Until updated, prevent affected users from opening unexpected links or websites in Microsoft Edge.

Vendor advisory Some work to apply

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

Microsoft Edge in Microsoft Windows 10 1511, 1607, 1703, and Windows Server 2016 allows an attacker to execute arbitrary code in the context of the current user, due to the way that Microsoft browser JavaScript engines render content when handling objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8649, CVE-2017-8729, CVE-2017-8738, CVE-2017-8740, CVE-2017-8741, CVE-2017-8748, CVE-2017-8752, CVE-2017-8753, CVE-2017-8755, CVE-2017-8756, and CVE-2017-11764.

In plain language

Written by AI from the record

This affects Microsoft Edge on Windows 10 1511, 1607, or 1703 and Windows Server 2016; businesses still using these systems should have them updated promptly.

Microsoft Edge has a user-triggered scripting-engine memory-corruption flaw that can enable arbitrary code execution in the current user’s context after visiting specially crafted web content.

If you're affected

User account takeover
Malware installation
Customer data exposure
Business disruption

What is it

A harmful website can exploit a flaw in Edge and run commands using the account of the person browsing it. Think of it as a visitor using a damaged lock at the front door to gain the same access as the employee who opened it.

Who is affected

This matters to you if your organization uses Microsoft Edge on the affected Windows systems. An attacker does not need an account, but someone must visit the attacker’s specially made web content.

How urgent is it

There is no record of confirmed active exploitation or public exploit code, so this is an amber-priority update rather than an emergency incident. It is still serious because a malicious webpage can take over the current user’s account after the user opens it.

What to do — in detail

Inventory endpoints and servers for the affected Windows releases, then identify devices where Microsoft Edge is used.
Review Microsoft’s CVE-2017-8660 advisory and apply the security update it specifies for each applicable Windows branch. The supplied findings do not identify fixed build or KB numbers, so use the advisory to select the correct update.
Use your normal Windows update deployment process and confirm successful installation on a representative device before broad rollout. No upgrade-path or breaking-change information is provided in the findings.
If deployment is delayed, restrict use of Edge on affected devices and block access to untrusted websites where practical.
No CISA KEV remediation due date applies because this CVE is not listed in the CISA Known Exploited Vulnerabilities catalog. Investigate browser crashes and unexpected child processes launched from Edge on affected devices.

Technical context

CVSS v3.0 is 8.8 (High): network attack vector, low attack complexity, no privileges required, user interaction required, and high confidentiality, integrity, and availability impact. CWE-119 memory corruption in Edge’s JavaScript/scripting engine is triggered by crafted web content and can yield arbitrary code execution in the current user context. CISA KEV does not list this CVE, and no public exploit code is on record. EPSS predicts a 10.1% likelihood and the trend is falling; this is a prediction, not evidence of exploitation.

This is a general assessment based on public vulnerability data. It does not account for your specific infrastructure — when in doubt, consult a security specialist.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS96th

CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

10% chance of exploitation activity in the next 30 days, which ranks it in the 96th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

23 events over 3297 days, from the signal feeds we watch.

2026-09-23EPSS band changelow → moderateepss band change
2026-09-21EPSS band changemoderate → lowepss band change
2026-09-06EPSS band change0 → moderateepss band change
2026-09-05EPSS band changemoderate → 0epss band change
2026-08-31EPSS band change0 → moderateepss band change
2026-08-29EPSS band changemoderate → low

Affected products

Microsoft Corporationcommercial · USaka microsoft
- Microsoft EdgeDesktop AppOn-premOperating Systems / windows
Microsoft Corpcommercial · USaka microsoft, microsoft corporation
- Microsoft EdgeDesktop AppOn-premConsumer Software / browser

And 1 more affected product. See all after sign-in

Technical detail

CVSS 3.0 vector

Open in the CVSS calculator

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Scored 8.8 by NVD.

How it is reached

Attack Vector NetworkExploitable remotely over the network without any special conditions
Attack Complexity LowNo special conditions — the attack can be reliably reproduced
Privileges Required NoneNo authentication required — anyone can exploit this
User Interaction RequiredA user must click a link, open a file, or perform some action

Scope

Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

Confidentiality HighTotal information disclosure — all data in the component is compromised
Integrity HighTotal loss of integrity — attacker can modify any data in the component
Availability HighTotal denial of service — the component is completely unavailable