CVE-2018-8229 in Edge
Summary
by MITRE
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-2018-8227.
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Analysis
by VulDB Data Team • 09/13/2025
The vulnerability identified as CVE-2018-8229 represents a critical memory corruption issue within Microsoft Edge's Chakra scripting engine, which serves as the JavaScript engine powering the browser's web content execution. This flaw exists in the manner in which the Chakra engine manages object allocation and memory handling during script execution, creating a pathway for remote code execution attacks. The vulnerability specifically targets the memory management subsystem of the scripting engine, where improper handling of object references leads to unpredictable memory states that can be exploited by malicious actors.
The technical nature of this vulnerability falls under the CWE-125 weakness category, which describes out-of-bounds read conditions that can occur when a program attempts to access memory beyond the boundaries of allocated buffers. In the context of the Chakra engine, this manifests when the scripting engine fails to properly validate object boundaries during memory operations, particularly when handling complex JavaScript objects that undergo dynamic memory allocation. The flaw allows attackers to craft malicious web content that, when rendered by Microsoft Edge, triggers memory corruption that can be leveraged to execute arbitrary code with the privileges of the browser process.
The operational impact of CVE-2018-8229 is severe and far-reaching, as it enables attackers to achieve remote code execution on vulnerable systems without requiring user interaction beyond visiting a malicious website. This vulnerability affects Microsoft Edge browsers running on Windows 10 and Windows Server 2016 systems, making it particularly dangerous in enterprise environments where Edge is commonly used as the default browser. The exploitability of this vulnerability aligns with ATT&CK technique T1203, which involves exploiting software vulnerabilities to gain remote access, and T1059, which covers the use of scripting languages for malicious purposes. The remote code execution capability means that attackers can install malware, steal sensitive data, or establish persistent access to compromised systems.
Mitigation strategies for this vulnerability require immediate patch deployment through Microsoft's regular security updates, as the company released a security bulletin addressing this specific memory corruption issue. Organizations should prioritize updating their Microsoft Edge browsers and ensure that all systems running Windows 10 or Windows Server 2016 receive the relevant security patches. Additionally, network administrators should implement browser hardening measures, including disabling unnecessary JavaScript features and implementing content security policies that limit the execution of potentially malicious scripts. The vulnerability also highlights the importance of maintaining up-to-date threat intelligence feeds and monitoring for exploitation attempts in network traffic, as attackers often leverage such vulnerabilities in targeted campaigns before public disclosure. Organizations should also consider implementing sandboxing mechanisms and browser isolation techniques to limit the potential damage from successful exploitation attempts, particularly in high-risk environments where sensitive data is processed.