CVE-2017-8656

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-2017-8656. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit leverages a bug in Chakra's bytecode generator where a catch parameter's symbol is not marked as a catch variable, leading to an uninitialized stack value being referenced. The PoC demonstrates this by using a destructuring pattern in the catch block.

Description

Microsoft Edge in Microsoft Windows 10 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-2017-8634, 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-2017-8657, CVE-2017-8670, CVE-2017-8671, CVE-2017-8672, and CVE-2017-8674.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · htmldoswindows
https://www.exploit-db.com/exploits/42464

This exploit leverages a bug in Chakra's bytecode generator where a catch parameter's symbol is not marked as a catch variable, leading to an uninitialized stack value being referenced. The PoC demonstrates this by using a destructuring pattern in the catch block.

Classification
Working Poc 100%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft ChakraCore (Edge/IE JavaScript engine)
No auth needed
Prerequisites: Target must execute the malicious JavaScript code
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/100033
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1039095
Exploit, Third Party Advisory exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/42464/

Scores

CVSS v3 7.5
EPSS 0.8188
EPSS Percentile 99.2%
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 Scripting Engine Microsoft Windows 10 1607, 1703, and Windows Server 2016.
Published Aug 08, 2017
Tracked Since Feb 18, 2026