EUVD-2025-19144CVSS Vector
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
PDF-XChange Editor U3D File Parsing Out-Of-Bounds Read Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of PDF-XChange Editor. 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 parsing of U3D 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 object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-26530.
Analysis
CVE-2025-6642 is a critical out-of-bounds read vulnerability in PDF-XChange Editor's U3D file parser that allows remote code execution with user interaction. The vulnerability affects PDF-XChange Editor across multiple versions and stems from improper validation of U3D file data structures, enabling attackers to read beyond allocated memory boundaries and execute arbitrary code in the application's context. While this vulnerability currently shows a CVSS 7.8 score indicating high severity, real-world exploitation requires user interaction (opening a malicious PDF or visiting a malicious page), moderating immediate organizational risk.
Technical Context
The vulnerability resides in PDF-XChange Editor's Universal 3D (U3D) file format parsing functionality. U3D is a 3D model format commonly embedded within PDF documents. The specific flaw involves insufficient boundary validation when parsing U3D stream objects and their associated data structures, classified under CWE-125 (Out-of-bounds Read). When processing a specially crafted U3D file, the parser fails to validate that read operations remain within allocated buffer boundaries, allowing an attacker to read adjacent memory regions. This out-of-bounds read can disclose sensitive data and be leveraged through information leakage to facilitate code execution via memory corruption techniques. The vulnerability was originally identified as ZDI-CAN-26530 through Trend Micro's Zero Day Initiative program.
Affected Products
Based on the CVE description, the primary affected product is: PDF-XChange Editor (all versions prior to patched release, specific version numbers not provided in the vulnerability description but typically includes versions 8.x through current 10.x releases as of 2025). The vulnerability specifically affects installations that process U3D-embedded PDF files. CPE designation would be approximately: cpe:2.3:a:tracker-software:pdf-xchange_editor:*:*:*:*:*:*:*:* (with version ranges to be specified by vendor advisory). PDF-XChange Viewer and other Tracker Software products using the same U3D parsing library may also be affected. Note: Specific version numbers and comprehensive CPE strings should be obtained directly from the Tracker Software security advisory and NVD entry, which are not fully detailed in the provided description.
Remediation
Remediation steps should follow this prioritization: (1) Immediate: Update PDF-XChange Editor to the patched version released by Tracker Software (consult vendor advisory for specific version numbers). (2) Interim Mitigations (pending patch deployment): Implement file type restrictions to prevent opening U3D-embedded PDFs from untrusted sources; disable U3D rendering in PDF-XChange Editor settings if such an option exists; educate users not to open PDF files from untrusted or unexpected sources; implement application whitelisting to restrict PDF-XChange Editor execution contexts. (3) Detection: Monitor for suspicious PDF-XChange Editor process behavior (out-of-memory errors, unexpected child processes, unusual memory access patterns) using endpoint detection and response (EDR) tools. (4) For air-gapped or legacy environments unable to patch immediately: consider sandboxing PDF-XChange Editor execution or using alternative PDF readers for untrusted documents. Consult Tracker Software's official security advisories at their website (tracker-software.com/security) for definitive patch availability and version information.
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