CVE-2018-0840

HIGH

Internet Explorer and 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-2018-0840. PoCs published by Google Security Research.

AI-analyzed exploit summary This exploit leverages a type confusion vulnerability in ChakraCore by manipulating the ImplicitCallFlags through exception handling during a 'typeof' operation. It achieves arbitrary memory read/write by corrupting array types.

Description

Internet Explorer in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, and Internet Explorer and Microsoft Edge in Windows 10 Gold, 1511, 1607, 1703, 1709, and Windows Server 2016 allows remote code execution, due to how the scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2018-0834, CVE-2018-0835, CVE-2018-0836, CVE-2018-0837, CVE-2018-0838, CVE-2018-0856, CVE-2018-0857, CVE-2018-0858, CVE-2018-0859, CVE-2018-0860, CVE-2018-0861, and CVE-2018-0866.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · javascriptdoswindows
https://www.exploit-db.com/exploits/44077

This exploit leverages a type confusion vulnerability in ChakraCore by manipulating the ImplicitCallFlags through exception handling during a 'typeof' operation. It achieves arbitrary memory read/write by corrupting array types.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft ChakraCore (Edge/IE JavaScript Engine)
No auth needed
Prerequisites: Target must be running a vulnerable version of ChakraCore (e.g., Microsoft Edge or Internet Explorer)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/44077/
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1040372
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1040369
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/102886

Scores

CVSS v3 7.5
EPSS 0.5336
EPSS Percentile 98.8%
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-787
Status published
Products (3)
microsoft/edge
microsoft/internet_explorer 11
microsoft/internet_explorer 10
Published Feb 15, 2018
Tracked Since Feb 18, 2026