CVE-2018-8384 in ChakraCore
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 ChakraCore. This CVE ID is unique from CVE-2018-8266, CVE-2018-8380, CVE-2018-8381.
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Analysis
by VulDB Data Team • 09/05/2025
The vulnerability identified as CVE-2018-8384 represents a critical memory corruption flaw within Microsoft Edge's Chakra scripting engine, which serves as the JavaScript engine powering the browser's execution environment. This vulnerability specifically manifests when the Chakra engine processes certain objects in memory, creating conditions that allow malicious actors to execute arbitrary code remotely. The flaw exists in the engine's memory management routines and object handling mechanisms, making it particularly dangerous as it can be exploited through web-based attacks without requiring user interaction beyond visiting a malicious webpage.
The technical nature of this vulnerability falls under the category of memory corruption issues, which are typically classified as CWE-125: "Out-of-bounds Read" and CWE-787: "Out-of-bounds Write" within the Common Weakness Enumeration framework. The Chakra engine's handling of object references and memory allocation during JavaScript execution creates opportunities for attackers to manipulate memory contents through crafted malicious scripts. When the engine encounters specific patterns in object manipulation, it fails to properly validate memory boundaries, leading to potential buffer overflows or memory corruption that can be leveraged for code execution. This type of vulnerability is particularly insidious because it operates at the intersection of browser security and scripting engine reliability.
The operational impact of CVE-2018-8384 extends beyond simple browser compromise, as it provides attackers with a pathway to establish persistent access to systems through remote code execution capabilities. Security researchers have mapped this vulnerability to the MITRE ATT&CK framework under techniques such as T1059.007: "Command and Scripting Interpreter: JavaScript" and T1203: "Exploitation for Client Execution." The vulnerability affects not only Microsoft Edge but also ChakraCore, which is used in various Microsoft products and applications, amplifying its potential impact across the enterprise environment. Organizations utilizing Microsoft Edge for browsing activities face immediate risk, while those deploying ChakraCore in custom applications or services must also assess their exposure to this memory corruption vulnerability.
Mitigation strategies for CVE-2018-8384 should prioritize immediate patch application from Microsoft, as the company released security updates addressing this specific memory corruption issue. Organizations should also implement network-level protections such as web application firewalls and content filtering systems that can detect and block malicious JavaScript payloads targeting this vulnerability. Browser hardening measures including disabling unnecessary JavaScript features, implementing strict content security policies, and using sandboxing techniques can further reduce attack surface. Additionally, security monitoring should focus on detecting anomalous JavaScript execution patterns and memory access violations that might indicate exploitation attempts. The vulnerability's classification as a remote code execution flaw necessitates comprehensive incident response planning, including network segmentation to limit potential lateral movement and regular security assessments to identify systems that may still be vulnerable due to delayed patching or legacy software configurations.