Advisory Details

June 25th, 2025

PDF-XChange Editor App Object Use-After-Free Remote Code Execution Vulnerability

ZDI-25-446
ZDI-CAN-26823

CVE ID CVE-2025-6661
CVSS SCORE 7.8, AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AFFECTED VENDORS PDF-XChange
AFFECTED PRODUCTS PDF-XChange Editor
VULNERABILITY DETAILS

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 handling of App objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS PDF-XChange has issued an update to correct this vulnerability. More details can be found at:
https://www.pdf-xchange.com/support/security-bulletins.html
DISCLOSURE TIMELINE
  • 2025-04-07 - Vulnerability reported to vendor
  • 2025-06-25 - Coordinated public release of advisory
  • 2025-06-25 - Advisory Updated
CREDIT Suyue Guo from UCSB Seclab
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