CVE-2020-10898 in PhantomPDF
Summary
by MITRE
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PhantomPDF 9.7.1.29511. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of U3D objects in PDF files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-10195.
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Analysis
by VulDB Data Team • 05/07/2026
The vulnerability identified as CVE-2020-10898 represents a critical remote code execution flaw affecting Foxit PhantomPDF version 9.7.1.29511 and potentially other versions within the same product line. This security weakness stems from insufficient input validation mechanisms within the PDF processing engine, specifically when handling Universal 3D (U3D) objects embedded within PDF documents. The flaw exists in the manner in which the software processes these three-dimensional graphics objects, creating a scenario where maliciously crafted U3D content can trigger unintended behavior in the application's memory management systems.
The technical root cause of this vulnerability lies in improper boundary checking during the parsing of U3D objects, which constitutes a classic buffer over-read condition. When the PDF viewer encounters a malformed U3D structure, the application fails to validate the size and boundaries of the data being processed, leading to memory access violations that can be exploited by attackers. This type of vulnerability maps directly to CWE-125: "Out-of-bounds Read" and falls under the broader category of memory safety issues that have been extensively documented in the cybersecurity community. The lack of proper input sanitization allows an attacker to craft malicious PDF files that contain specially designed U3D objects capable of bypassing normal security boundaries.
The operational impact of this vulnerability is severe as it enables remote code execution without requiring administrative privileges, making it particularly dangerous in enterprise environments where users frequently interact with PDF documents from external sources. Attackers can leverage this flaw through various attack vectors including malicious websites, phishing emails containing infected attachments, or compromised web portals where PDF documents are served. The exploitation requires user interaction, typically involving the opening of a malicious PDF file or visiting a compromised webpage that loads the malicious content, which aligns with the attack pattern described in the attack technique T1203: "Exploitation for Client Execution" from the MITRE ATT&CK framework. Once executed, the malicious code operates within the context of the currently running PhantomPDF process, potentially allowing for full system compromise or privilege escalation depending on the user's permissions.
Organizations affected by this vulnerability should prioritize immediate remediation through official software updates provided by Foxit Corporation, as the vendor has acknowledged and addressed this issue in subsequent releases. System administrators should implement network-based protections such as web application firewalls and PDF content filtering solutions to prevent the delivery of potentially malicious PDF files to end users. Additionally, user education regarding the dangers of opening untrusted PDF documents remains crucial, particularly in environments where users may encounter suspicious emails or websites. Security teams should consider implementing behavioral monitoring solutions to detect anomalous PDF processing activities that might indicate exploitation attempts, while also ensuring that all PDF viewing applications are kept current with the latest security patches. The vulnerability demonstrates the importance of robust input validation and memory safety practices in document processing software, particularly in applications that handle complex multimedia content like 3D objects within structured documents.