CVE-2017-8740

HIGH

Microsoft Edge - Remote Code Execution via Scripting Engine Memory Corruption

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2017-8740. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit leverages a bytecode generation flaw in Chakra (CVE-2017-8740) where the 'DeferParse' feature causes incorrect opcode emission, leading to an out-of-bounds write. The PoC triggers the vulnerability by forcing a specific scope handling condition in Edge's JavaScript engine.

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 the Microsoft Edge scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8649, CVE-2017-8660, 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.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · htmldoswindows
https://www.exploit-db.com/exploits/42764

This exploit leverages a bytecode generation flaw in Chakra (CVE-2017-8740) where the 'DeferParse' feature causes incorrect opcode emission, leading to an out-of-bounds write. The PoC triggers the vulnerability by forcing a specific scope handling condition in Edge's JavaScript engine.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Edge (Chakra JavaScript Engine)
No auth needed
Prerequisites: Target must be running a vulnerable version of Microsoft Edge
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/100763
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1039342
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/42764/

Scores

CVSS v3 7.5
EPSS 0.7823
EPSS Percentile 99.0%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-119
Status published
Products (2)
microsoft/edge
Microsoft Corporation/Microsoft Edge Microsoft Windows 10 1703
Published Sep 13, 2017
Tracked Since Feb 18, 2026