CVE-2014-0309 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 8 through 10 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."
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Analysis
by VulDB Data Team • 05/07/2026
Microsoft Internet Explorer versions 8 through 10 contained a critical memory corruption vulnerability that enabled remote attackers to execute arbitrary code or cause denial of service conditions through malicious web content. This vulnerability specifically affected the browser's handling of memory allocation and deallocation processes during web page rendering. The flaw occurred when Internet Explorer processed certain malformed or crafted web elements that triggered improper memory management operations, leading to buffer overflows or heap corruption that could be exploited to gain unauthorized code execution privileges.
The technical nature of this vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient memory management controls allow attackers to overwrite adjacent memory locations. The vulnerability stems from inadequate input validation and memory handling within Internet Explorer's rendering engine, particularly when processing complex web page structures or embedded objects. Attackers could craft malicious web pages containing specially formatted data that would cause the browser to allocate insufficient memory for certain operations, resulting in memory corruption that could be leveraged for code execution.
From an operational perspective, this vulnerability posed significant risks to enterprise environments where Internet Explorer remained the primary browser for business operations. The remote exploitation capability meant that users could be compromised simply by visiting malicious websites, making it particularly dangerous for targeted attacks. The memory corruption could result in browser crashes, application instability, or complete system compromise depending on the execution context and attacker's objectives. Organizations running older versions of Internet Explorer faced heightened exposure since these browsers were commonly used in corporate environments where legacy applications required specific browser compatibility.
The attack surface for this vulnerability extended beyond simple web browsing to include any scenario where users might encounter malicious web content through email attachments, web portals, or social engineering campaigns. Security professionals noted that the exploit required minimal user interaction beyond visiting a compromised website, making it particularly effective for widespread exploitation. The vulnerability's impact was compounded by the fact that many organizations had not yet transitioned to newer browser versions, leaving them exposed to attacks that could bypass traditional network security controls. Mitigation strategies included immediate patch deployment, browser version updates, and implementation of additional security controls such as browser isolation and network segmentation to limit potential exploitation.
Organizations should have implemented comprehensive patch management processes to address this vulnerability promptly, as the window for exploitation was significant given the widespread use of affected Internet Explorer versions. The vulnerability highlighted the importance of maintaining up-to-date browser software and implementing layered security approaches that could detect and prevent exploitation attempts. Security frameworks such as the ATT&CK matrix would classify this vulnerability under the Tactic of Execution with techniques related to exploitation of software vulnerabilities, emphasizing the need for both preventive measures and detection capabilities in enterprise security programs.