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CVE-2025-6647: PDF-XChange Editor U3D File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-25 · updated 2026-06-17
• Weakness: CWE-787

Description

PDF-XChange Editor U3D File Parsing Out-Of-Bounds Write 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 write 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-26644.

Affected products

• PDF-XChange Pdf-Tools: 10.5.2.395
• PDF-XChange Editor: 10.5.2.395

References

• https://www.pdf-xchange.com/support/security-bulletins.html
• https://www.zerodayinitiative.com/advisories/ZDI-25-432/

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