CVE-2015-2459 in Windows
Summary
by MITRE
ATMFD.DLL in the Windows Adobe Type Manager Library in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 allows remote attackers to execute arbitrary code via a crafted OpenType font, aka "OpenType Font Parsing Vulnerability," a different vulnerability than CVE-2015-2458 and CVE-2015-2461.
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Analysis
by VulDB Data Team • 05/11/2025
The vulnerability identified as CVE-2015-2459 represents a critical security flaw within the Windows Adobe Type Manager Library, specifically within the ATMFD.DLL component that handles OpenType font processing. This vulnerability affects multiple Windows operating systems including Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012, Windows RT, and Windows 10, making it one of the most widespread font-related security issues in the Windows ecosystem. The flaw manifests when the system processes specially crafted OpenType font files, which are commonly used for typography and text rendering in various applications and operating system components.
The technical nature of this vulnerability stems from improper input validation and memory handling within the ATMFD.DLL library when parsing OpenType font files. Attackers can exploit this by creating malicious font files that contain malformed data structures or oversized buffers that cause buffer overflows or other memory corruption issues during the font parsing process. When a vulnerable system encounters such a crafted font file, either through normal user interaction with documents containing the font or through automated exploitation via web browsers or email clients that render fonts, the memory corruption leads to arbitrary code execution with the privileges of the affected process. This typically results in system compromise, as the exploitation often occurs within the context of user applications or system services that handle font rendering.
The operational impact of CVE-2015-2459 extends far beyond simple code execution, as it represents a significant attack surface that can be leveraged for privilege escalation and persistent system compromise. The vulnerability is particularly dangerous because OpenType fonts are widely used throughout the Windows operating system and applications, making exploitation possible through numerous vectors including web browsing, email attachments, document files, and even system-level font installations. Security researchers have categorized this vulnerability under CWE-121, which describes heap-based buffer overflow conditions, and it aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage in the context of exploitation. The vulnerability's exploitation often bypasses traditional security controls because font processing occurs at a low system level, making it difficult to detect and prevent through conventional means.
Mitigation strategies for CVE-2015-2459 require a multi-layered approach that combines immediate patching with operational security measures. Microsoft released security updates in May 2015 that addressed this vulnerability through proper input validation and memory handling improvements in the ATMFD.DLL component. Organizations should prioritize immediate deployment of these patches across all affected systems, particularly those exposed to untrusted content or users. Additional protective measures include implementing application whitelisting policies to restrict font file processing, disabling automatic font downloading in web browsers, and configuring security software to monitor for suspicious font-related file operations. Network-level protections such as firewalls and intrusion detection systems can help detect exploitation attempts, while endpoint protection solutions should be configured to monitor for unusual memory access patterns that may indicate buffer overflow exploitation attempts. The vulnerability also highlights the importance of keeping all system components updated and maintaining comprehensive security monitoring to detect and respond to similar font-based exploitation techniques that may emerge in the future.