CVE-2018-8466 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-2018-8367, CVE-2018-8465, CVE-2018-8467.
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Analysis
by VulDB Data Team • 09/08/2025
The vulnerability identified as CVE-2018-8466 represents a critical remote code execution flaw within Microsoft Edge's Chakra scripting engine, specifically manifesting as a memory corruption issue that can be exploited by attackers to gain unauthorized system access. This vulnerability resides in the fundamental memory management operations of the Chakra engine, which is Microsoft's high-performance JavaScript engine used in Edge browser and ChakraCore runtime environment. The flaw occurs during the handling of objects in memory, where improper memory management leads to unpredictable behavior that can be leveraged by malicious actors to execute arbitrary code on affected systems.
The technical nature of this vulnerability falls under CWE-125, which describes "Out-of-bounds Read" conditions that can occur when software reads data from memory locations outside the intended boundaries of allocated buffers. In the context of the Chakra engine, this manifests when the scripting engine processes JavaScript objects that have been improperly allocated or manipulated, leading to memory corruption that allows attackers to overwrite critical memory locations. The vulnerability is particularly dangerous because it operates at the core level of the JavaScript engine, where legitimate script execution can be manipulated to trigger the memory corruption through carefully crafted malicious code sequences.
From an operational perspective, this vulnerability affects Microsoft Edge browsers and the ChakraCore engine, making it a significant concern for enterprise environments where these technologies are widely deployed. The remote code execution capability means that attackers can exploit this vulnerability through web-based attacks without requiring local system access or user interaction beyond visiting a malicious website. This makes the attack surface extremely broad, as any user browsing the internet with an affected Edge browser or application using ChakraCore is potentially at risk. The vulnerability's impact extends beyond individual users to enterprise networks, as successful exploitation can lead to complete system compromise and lateral movement within network environments.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, specifically under techniques related to exploitation of remote services and execution of malicious code through browser-based attacks. The vulnerability aligns with ATT&CK technique T1203, "Exploitation for Client Execution," where attackers leverage browser vulnerabilities to execute code on target systems. Organizations should implement immediate mitigations including applying Microsoft security updates, deploying browser isolation solutions, and configuring network-based protections to prevent access to known malicious domains. 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 memory corruption issue also necessitates regular system integrity checks and memory scanning tools to identify potential exploitation indicators.