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UK Cyber Defence
VulnerabilityModified

CVE-2017-8634

Microsoft Edge in Microsoft Windows 10 1703 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…

EXPLOIT ✓HIGH 7.5EPSS 70.3%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 70.3%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

Description

Microsoft Edge in Microsoft Windows 10 1703 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-2017-8635, CVE-2017-8636, CVE-2017-8638, CVE-2017-8639, CVE-2017-8640, CVE-2017-8641, CVE-2017-8645, CVE-2017-8646, CVE-2017-8647, CVE-2017-8655, CVE-2017-8656, CVE-2017-8657, CVE-2017-8670, CVE-2017-8671, CVE-2017-8672, and CVE-2017-8674.

CVSS 3.0
7.5 HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
70.28% probability · 99th percentile
Public exploits
1 in Exploit-DB · verified · first 17 August 2017
CISA KEV
Not listed
Weakness
CWE-119
Affected
microsoft/edge
Source
secure@microsoft.com
EPSS trend
0%38%75%21 September 2026: 58.15%22 September 2026: 70.28%27 October 2026: 70.28%21 September 202627 October 2026

EPSS moved from 58.1% on 21 September 2026 to 70.3% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

Public exploits (1)

Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.

EDB-IDTitleTypePublishedVerified
EDB-42474source ↗Microsoft Edge Chakra - 'JavascriptArray::ConcatArgs' Type Confusionwindows · Google Security Researchdos17 August 2017yes

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.