CVE-2018-8133

HIGH EXPLOITED IN THE WILD

Microsoft Edge and ChakraCore - Remote Code Execution via Type Confusion

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2018-8133 has been observed exploited in the wild (reported by VulnCheck KEV, InTheWild.io). EIP tracks 1 public exploit from researchers including Google Security Research.

AI-analyzed exploit summary This exploit leverages a type confusion vulnerability in ChakraCore (CVE-2018-8133) by manipulating array types during JIT optimization, leading to arbitrary memory corruption. The PoC uses a Proxy object to trigger a side effect in the 'getPrototypeOf' handler, causing type confusion in the optimized code.

Description

A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-0943, CVE-2018-8130, CVE-2018-8145, CVE-2018-8177.

Exploits (1)

exploitdb WORKING POC VERIFIED
by Google Security Research · javascriptdoswindows
https://www.exploit-db.com/exploits/44817

This exploit leverages a type confusion vulnerability in ChakraCore (CVE-2018-8133) by manipulating array types during JIT optimization, leading to arbitrary memory corruption. The PoC uses a Proxy object to trigger a side effect in the 'getPrototypeOf' handler, causing type confusion in the optimized code.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Microsoft ChakraCore (Edge/IE JavaScript engine)
No auth needed
Prerequisites: Victim must visit a malicious webpage · Browser using ChakraCore (e.g., Microsoft Edge or Internet Explorer)
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/103982
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/44817/
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1040844

Scores

CVSS v3 7.5
EPSS 0.6226
EPSS Percentile 98.4%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

VulnCheck KEV 2021-08-17
InTheWild.io 2021-08-17
CWE
CWE-843
Status published
Products (3)
microsoft/chakracore < 1.8.3
microsoft/edge
nuget/Microsoft.ChakraCore 0 - 1.8.4NuGet
Published May 09, 2018
Tracked Since Feb 18, 2026