CVE-2015-2419 in Internet Explorer
Summary
by MITRE
JScript 9 in Microsoft Internet Explorer 10 and 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "JScript9 Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 04/22/2026
The CVE-2015-2419 vulnerability represents a critical memory corruption flaw within JScript 9 engine of Microsoft Internet Explorer versions 10 and 11. This vulnerability falls under the Common Weakness Enumeration category CWE-125, which describes out-of-bounds read conditions that can lead to memory corruption. The flaw exists in the scripting engine's handling of certain JavaScript objects and memory management operations, creating a pathway for malicious actors to exploit memory layout vulnerabilities through crafted web content.
The technical exploitation of this vulnerability occurs when Internet Explorer processes malicious JavaScript code that triggers improper memory handling within the JScript 9 engine. Attackers can construct web pages containing specially crafted JavaScript code that manipulates object references and memory pointers in ways that cause the engine to write beyond allocated memory boundaries or read invalid memory locations. This memory corruption can result in arbitrary code execution with the privileges of the victim user or cause denial of service through application crashes and memory corruption.
From an operational perspective, this vulnerability presents significant risk to enterprise environments where Internet Explorer remains in use, particularly in legacy systems that have not been migrated to modern browsers. The attack vector requires user interaction with a malicious website, making it susceptible to phishing campaigns and drive-by download scenarios. The vulnerability's impact is amplified by the fact that Internet Explorer was widely used across corporate networks, making successful exploitation potentially devastating for organizations. The memory corruption can manifest in various ways including application crashes, browser instability, or complete system compromise depending on the specific memory locations overwritten.
Security professionals should implement multiple layers of defense to mitigate this vulnerability. Browser isolation techniques and sandboxing mechanisms provide effective protection against exploitation attempts, while regular patch management ensures that the underlying JScript engine receives necessary security updates. Network-based protections such as web application firewalls and content filtering systems can help detect and block malicious JavaScript payloads before they reach vulnerable browsers. Organizations should also consider implementing browser hardening measures including disabling unnecessary JavaScript features, restricting ActiveX controls, and employing security policies that limit browser capabilities to reduce attack surface. The vulnerability highlights the importance of maintaining up-to-date browser security patches and demonstrates how scripting engine vulnerabilities can create persistent security risks in enterprise environments where legacy browser support is maintained.