CVE-2018-8619 in Internet Explorer
Summary
by MITRE
A remote code execution vulnerability exists when the Internet Explorer VBScript execution policy does not properly restrict VBScript under specific conditions, aka "Internet Explorer Remote Code Execution Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10.
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Analysis
by VulDB Data Team • 09/16/2025
The vulnerability identified as CVE-2018-8619 represents a critical remote code execution flaw within Microsoft Internet Explorer browsers, specifically affecting versions 9, 10, and 11. This vulnerability stems from improper enforcement of VBScript execution policies under certain conditions, creating a significant security gap that adversaries can exploit to execute arbitrary code on affected systems. The flaw exists within the browser's scripting engine where VBScript restrictions are not properly enforced, allowing malicious actors to bypass security controls that should prevent unauthorized script execution. This issue demonstrates a fundamental failure in the browser's security model, particularly in how it handles script execution policies and sandboxing mechanisms.
The technical nature of this vulnerability lies in the improper handling of VBScript execution within Internet Explorer's security framework. When specific conditions are met, the browser fails to enforce the necessary restrictions that should prevent VBScript from executing in potentially dangerous contexts. This misconfiguration creates an attack surface where malicious scripts can be executed with elevated privileges, effectively bypassing the browser's security boundaries. The vulnerability is particularly concerning because VBScript has historically been used for legitimate automation tasks but can also serve as a vector for malicious code execution. According to CWE classification, this represents a weakness in the security policy enforcement mechanism where execution restrictions are not properly applied. The flaw aligns with ATT&CK technique T1059.005 which describes the use of scripting languages for execution, specifically highlighting how VBScript can be leveraged for malicious purposes when security controls are bypassed.
The operational impact of CVE-2018-8619 extends beyond simple remote code execution, as it can enable full system compromise when exploited successfully. Attackers can craft malicious web pages that, when viewed in affected Internet Explorer versions, automatically execute malicious VBScript code without user interaction. This automated exploitation capability means that users can be compromised simply by visiting malicious websites, making the vulnerability particularly dangerous in phishing campaigns and drive-by download scenarios. The vulnerability affects the core browser functionality and can lead to complete system compromise, data exfiltration, and persistence mechanisms being established. Organizations running these older browser versions face significant risk as Internet Explorer 9, 10, and 11 are no longer supported with security updates, leaving them vulnerable to exploitation by threat actors who actively seek out such legacy vulnerabilities.
Mitigation strategies for CVE-2018-8619 should prioritize immediate remediation through browser updates and security patches, though these legacy versions are no longer receiving official patches from Microsoft. Organizations should implement network-level protections such as web application firewalls and content filtering solutions to block malicious VBScript content. Browser isolation techniques and virtualization approaches can provide additional defense layers to prevent exploitation attempts from affecting production systems. Security awareness training should emphasize the dangers of visiting untrusted websites and the importance of keeping browsers updated. The vulnerability highlights the critical need for organizations to phase out legacy browser versions and migrate to supported platforms, as continued use of unsupported software creates persistent security risks. Additionally, implementing strict security policies that disable VBScript execution entirely in browser environments can provide a temporary workaround while longer-term migration strategies are implemented. Organizations should also consider deploying endpoint detection and response solutions that can identify and block suspicious VBScript execution patterns, as this vulnerability often manifests through specific behavioral indicators that can be detected through proper monitoring.