CVE-2016-3718 in ImageMagick
Summary
by MITRE
The (1) HTTP and (2) FTP coders in ImageMagick before 6.9.3-10 and 7.x before 7.0.1-1 allow remote attackers to conduct server-side request forgery (SSRF) attacks via a crafted image.
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Analysis
by VulDB Data Team • 04/23/2026
The vulnerability identified as CVE-2016-3718 represents a critical server-side request forgery flaw affecting ImageMagick's HTTP and FTP coders. This security weakness exists in ImageMagick versions prior to 6.9.3-10 and 7.x versions before 7.0.1-1, creating a significant attack surface for remote threat actors. The flaw allows malicious users to manipulate the image processing pipeline to make unauthorized network requests to arbitrary destinations, effectively bypassing network segmentation and access controls that would normally protect internal systems.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within ImageMagick's image handling mechanisms. When processing images that contain crafted HTTP or FTP URLs, the software fails to properly validate the destination addresses, allowing attackers to specify malicious endpoints. This occurs because the image processing libraries do not adequately restrict the protocols that can be invoked during image operations, enabling attackers to construct specially formatted image files that trigger unintended network communications. The vulnerability specifically affects the HTTP and FTP coder components, which are responsible for handling remote resource retrieval during image processing operations.
The operational impact of this vulnerability is substantial as it enables attackers to perform reconnaissance activities against internal networks, potentially accessing systems that would otherwise be protected by firewalls or network security controls. An attacker could leverage this flaw to probe internal services, exfiltrate data from internal systems, or even establish command and control channels through the image processing pipeline. The vulnerability is particularly dangerous because it can be exploited through legitimate image upload functionality, making it difficult to detect and prevent. Organizations using ImageMagick for image processing in web applications, file upload systems, or content management platforms face significant risk from this flaw.
Mitigation strategies for CVE-2016-3718 should prioritize immediate patching of affected ImageMagick installations to versions 6.9.3-10 or 7.0.1-1 where the vulnerability has been addressed. Network-level controls including firewall rules that restrict outbound connections from image processing servers and web application firewalls that monitor for suspicious URL patterns can provide additional protection layers. Input validation and sanitization should be implemented at the application level to prevent malformed image files from reaching the ImageMagick processing pipeline. Organizations should also consider implementing network segmentation to isolate image processing components from critical internal systems, following the principle of least privilege. This vulnerability aligns with CWE-918, which describes server-side request forgery vulnerabilities, and maps to ATT&CK technique T1071.004 for application layer protocol manipulation, emphasizing the need for comprehensive network security controls beyond simple patch management.
The vulnerability demonstrates how image processing libraries can become attack vectors for sophisticated network reconnaissance and exploitation activities. Security teams must recognize that seemingly benign functionality like image upload and processing can hide significant security risks when proper input validation and network access controls are not implemented. Regular security assessments of image handling components and continuous monitoring for unusual outbound network connections should be part of ongoing security operations to detect potential exploitation attempts.