Use After Free in Pdf-Xchange Pdf-Tools
CVE-2025-6646
PDF-XChange Editor U3D File Parsing Use-After-Free Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information 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 validating the existence of an object prior to performing operations on the object. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-26643.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000
Affected products
- Pdf-Xchange Pdf-Tools — versions 10.5.2.395
- Pdf-Xchange Editor — versions 10.5.2.395
- Pdf-Xchange Editor — versions 10.5.2.395
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-25-431/ (x_research-advisory, Third Party Advisory)
- www.pdf-xchange.com/support/security-bulletins.html (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-6646?
- CVE-2025-6646 is a low-severity vulnerability in Pdf-Xchange Pdf-Tools, classified under Use After Free. CVSS score: 3.3/10. Published 2025-06-25.
- How severe is CVE-2025-6646?
- Low severity. CVSS v3 base score is 3.3 out of 10.