CVE-2017-0202 in Internet Explorer
Summary
by MITRE
A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user, a.k.a. "Internet Explorer Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 12/23/2025
The vulnerability identified as CVE-2017-0202 represents a critical memory corruption flaw within Microsoft Internet Explorer that enables remote code execution attacks. This vulnerability stems from Internet Explorer's improper handling of object references in memory, specifically when processing certain web content that triggers memory corruption conditions. The flaw exists in the browser's scripting engine and affects multiple versions of Internet Explorer including IE 11 and earlier versions. According to the Common Weakness Enumeration framework, this vulnerability maps to CWE-125, which describes out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution. The vulnerability is particularly dangerous because it allows attackers to execute malicious code with the privileges of the currently logged-in user, potentially leading to full system compromise.
The technical implementation of this vulnerability occurs when Internet Explorer processes web content containing specially crafted objects that cause memory allocation issues. When the browser attempts to access these improperly managed memory objects, the corruption can lead to unpredictable behavior including buffer overflows or pointer corruption. Attackers can exploit this by hosting malicious web pages that trigger the vulnerable code path during normal browsing operations. The attack typically involves crafting web content that forces Internet Explorer to perform operations on memory regions that have already been freed or are otherwise invalid. This type of vulnerability is categorized under the ATT&CK framework as T1203 - Exploitation for Client Execution, where adversaries leverage browser vulnerabilities to execute code on target systems.
The operational impact of CVE-2017-0202 extends beyond simple remote code execution, as successful exploitation can result in complete system compromise. An attacker who successfully exploits this vulnerability can gain the same privileges as the current user, potentially allowing them to install malware, modify system files, access sensitive data, or establish persistent backdoors. The vulnerability is particularly concerning in enterprise environments where Internet Explorer is still in use, as it can serve as a vector for lateral movement within networks. Organizations running older versions of Internet Explorer face significant risk since this vulnerability affects systems that may not receive regular security updates, especially those running legacy operating systems that are no longer supported. The memory corruption aspect makes detection difficult as the attack may not immediately manifest in obvious system behavior, allowing attackers to maintain persistence without immediate detection.
Mitigation strategies for CVE-2017-0202 should include immediate deployment of Microsoft security patches and updates, as well as organizational measures to reduce attack surface. System administrators should implement browser hardening techniques including disabling unnecessary browser features, implementing content security policies, and using application whitelisting solutions to prevent execution of unauthorized code. The use of modern security tools such as exploit protection mechanisms, sandboxing, and network monitoring can help detect and prevent exploitation attempts. Organizations should also consider migrating away from Internet Explorer to more secure modern browsers, as Internet Explorer has been deprecated by Microsoft in favor of Microsoft Edge. Additionally, implementing security awareness training for users to recognize potentially malicious web content and avoiding untrusted websites can significantly reduce the risk of exploitation. The vulnerability highlights the importance of maintaining up-to-date security patches and the dangers of continued use of unsupported software platforms that no longer receive security updates.