CVE-2014-0303 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 6 through 8 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability," a different vulnerability than CVE-2014-0302.
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Analysis
by VulDB Data Team • 05/07/2026
The vulnerability identified as CVE-2014-0303 represents a critical memory corruption flaw in Microsoft Internet Explorer versions 6 through 8 that enables remote code execution attacks. This vulnerability specifically affects legacy browser versions that were widely deployed in enterprise environments during the early 2010s period. The flaw manifests when users visit malicious websites that contain specially crafted HTML or JavaScript content designed to exploit memory management issues within the browser's rendering engine. This particular vulnerability operates distinct from CVE-2014-0302, which indicates that attackers could leverage different attack vectors to achieve similar outcomes. The memory corruption occurs in the browser's handling of specific object structures, particularly affecting how Internet Explorer processes certain web elements that trigger buffer overflows or heap corruption conditions.
The technical exploitation of this vulnerability relies on the attacker's ability to manipulate memory addresses through crafted web content that causes the browser to execute malicious code in the context of the user's session. This type of vulnerability falls under the CWE-125 weakness category, which describes out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution. The attack typically involves constructing malicious web pages that utilize JavaScript or ActiveX controls to trigger the memory corruption within Internet Explorer's memory management subsystem. Attackers can leverage this vulnerability to execute malicious code with the privileges of the logged-in user, potentially leading to complete system compromise.
The operational impact of CVE-2014-0303 extends beyond simple remote code execution to include potential denial of service scenarios that can disrupt user productivity and system availability. Organizations running affected versions of Internet Explorer face significant risk exposure, particularly in environments where legacy systems remain operational due to application dependencies or migration delays. The vulnerability's exploitation can result in system crashes, browser instability, and unauthorized access to sensitive information. This risk is compounded by the fact that many organizations had not yet transitioned to newer browser versions, leaving their infrastructure vulnerable to attacks that could be delivered through simple web browsing activities. The vulnerability's impact is further amplified by the widespread use of Internet Explorer 6 through 8 in corporate environments during the affected timeframe.
Mitigation strategies for CVE-2014-0303 primarily focus on immediate remediation through Microsoft security patches and updates, although support for these legacy versions has long since ended. Organizations should implement browser isolation techniques and network segmentation to limit the potential impact of successful exploitation attempts. Security controls including web application firewalls and content filtering systems can help detect and block malicious web content before it reaches user systems. The vulnerability demonstrates the importance of maintaining up-to-date security patches and implementing robust browser security policies. According to ATT&CK framework, this vulnerability maps to techniques involving exploitation of memory corruption and privilege escalation, highlighting the need for comprehensive endpoint protection measures. Organizations should also consider implementing user education programs to reduce the risk of social engineering attacks that could lead to visiting malicious websites. The vulnerability serves as a critical reminder of the importance of maintaining secure browser configurations and the dangers associated with running unsupported software versions in enterprise environments.