How severe is CVE-2025-63917?

CVE-2025-63917 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability low.

Is CVE-2025-63917 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-63917?

CVE-2025-63917 affects Cnblogs Pdfpatcher. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-63917?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-63917 have an EU (EUVD) identifier?

Yes. CVE-2025-63917 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-197810.

When was CVE-2025-63917 published?

CVE-2025-63917 was published on 2025-11-17 and last updated on 2026-06-17.

CVE-2025-63917

CVE-2025-63917 is a high-severity vulnerability in Cnblogs Pdfpatcher with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-197810
Weakness: CWE-611
Affected product: Cnblogs Pdfpatcher
Published: 2025-11-17
Last modified: 2026-06-17

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.

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.
How severe is CVE-2025-63917?: CVE-2025-63917 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability low.
Is CVE-2025-63917 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-63917?: CVE-2025-63917 affects Cnblogs Pdfpatcher. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-63917?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-63917 have an EU (EUVD) identifier?: Yes. CVE-2025-63917 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-197810.
When was CVE-2025-63917 published?: CVE-2025-63917 was published on 2025-11-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cnblogs:pdfpatcher:*:*:*:*:*:*:*:*

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