CVE-2025-63917: pdfpatcher XXE — Exploit

Description

PDFPatcher thru 1.1.3.4663 executable's XML bookmark import functionality does not restrict XML external entity (XXE) references. The application uses .NET's XmlDocument class without disabling external entity resolution, enabling attackers to: Read arbitrary files from the victim's filesystem, exfiltrate sensitive data via out-of-band (OOB) HTTP requests, perform SSRF attacks against internal network resources, or cause a denial of service via entity expansion attacks.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L

Weakness Type (CWE)

CWE-611 CWE-611

Affected Products

Vendor	Product	Versions
cnblogs	pdfpatcher	< 1.1.3.4663

References

Exploits

https://github.com/cydtseng/Vulnerability-Research/blob/main/pdfpatcher/XXE-Importers.md

Other References

https://github.com/wmjordan/PDFPatcher https://www.cnblogs.com/pdfpatcher

Frequently Asked Questions

What is CVE-2025-63917? +

PDFPatcher thru 1.1.3.4663 executable's XML bookmark import functionality does not restrict XML external entity (XXE) references. The application uses .NET's XmlDocument class without disabling external entity resolution, enabling attackers to: Read arbitrary files from the victim's filesystem, exfiltrate sensitive data via out-of-band (OOB) HTTP requests, perform SSRF attacks against internal network resources, or cause a denial of service via entity expansion attacks. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-63917? +

CVE-2025-63917 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-63917? +

CVE-2025-63917 affects products from cnblogs, specifically: pdfpatcher. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-63917? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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