CVE-2017-8641 in Internet Explorer
Summary
by MITRE
Microsoft browsers in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allow an attacker to execute arbitrary code in the context of the current user due to the way that Microsoft browser JavaScript engines render when handling objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8634, CVE-2017-8635, CVE-2017-8636, CVE-2017-8638, CVE-2017-8639, CVE-2017-8640, CVE-2017-8645, CVE-2017-8646, CVE-2017-8647, CVE-2017-8655, CVE-2017-8656, CVE-2017-8657, CVE-2017-8670, CVE-2017-8671, CVE-2017-8672, and CVE-2017-8674.
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Analysis
by VulDB Data Team • 12/14/2025
This vulnerability represents a critical memory corruption flaw in Microsoft's JavaScript engines that affects multiple operating system versions including windows 7 sp1 through windows 10 version 1703. The issue stems from improper handling of objects in memory during javascript execution, creating a pathway for remote code execution attacks. The vulnerability specifically impacts the scripting engine's memory management capabilities when processing certain object types, allowing attackers to manipulate memory contents and potentially execute arbitrary code with the privileges of the current user. This type of vulnerability falls under the CWE-125 vulnerability category, which encompasses out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution. The attack surface is particularly broad given the widespread use of affected windows operating systems across enterprise environments, making this vulnerability highly attractive to threat actors seeking persistent access to target networks.
The technical exploitation of this vulnerability requires an attacker to craft malicious javascript code that triggers the memory corruption during object rendering processes within the browser's javascript engine. This typically occurs when the engine encounters malformed or specially crafted objects in memory that cause it to improperly handle memory allocation and deallocation. The memory corruption can manifest through various attack vectors including web-based exploitation, where malicious websites deliver payloads that trigger the vulnerable code path. Attackers may leverage this vulnerability in conjunction with other techniques such as sandbox escapes or privilege escalation methods to gain deeper system access. According to the mitre att&ck framework, this vulnerability maps to the technique of "exploitation for client execution" under the initial access and execution phases, potentially leading to more sophisticated attacks such as "process injection" or "command and control" activities once initial compromise is achieved. The vulnerability's impact extends beyond simple code execution as it can enable attackers to bypass security controls and establish persistent presence within target environments.
The operational impact of this vulnerability is severe for organizations running affected windows versions, as it provides attackers with a reliable method for gaining unauthorized access to systems. The vulnerability affects browsers including internet explorer and edge, making it particularly dangerous in enterprise environments where these browsers are commonly used for business operations. Organizations may experience significant security incidents including data breaches, system compromise, and potential lateral movement within their networks. The vulnerability's presence in both desktop and server operating systems creates additional risk for organizations with mixed environments. Security teams must consider this vulnerability alongside other related issues such as CVE-2017-8634 through CVE-2017-8674, as these vulnerabilities often represent part of coordinated attack campaigns. The exploitation of this vulnerability can lead to complete system compromise, making it a critical priority for security administrators to address immediately through patch management processes and other mitigation strategies.
Mitigation strategies for this vulnerability primarily involve applying microsoft security updates as soon as they become available, which address the underlying memory corruption in the javascript engines. Organizations should implement comprehensive patch management processes to ensure all affected systems receive updates promptly. Additional protective measures include browser hardening configurations, such as disabling javascript execution in certain contexts, implementing application whitelisting policies, and deploying intrusion detection systems to monitor for exploitation attempts. Security teams should also consider network segmentation and access controls to limit the potential impact of successful exploitation attempts. The implementation of security awareness training can help reduce the risk of users inadvertently visiting malicious websites that exploit this vulnerability. Organizations should maintain detailed inventory records of all affected systems to ensure comprehensive remediation efforts. Microsoft recommends immediate deployment of the security update as part of their standard security response procedures, and organizations should follow their guidance for implementing layered defense strategies. Regular security assessments and vulnerability scanning should be conducted to identify any remaining systems that may still be vulnerable to this or related memory corruption vulnerabilities.