CVE-2025-21609
B3log Siyuan vulnerability
- Published3 Jan 2025
Description
SiYuan is self-hosted, open source personal knowledge management software. SiYuan Note version 3.1.18 has an arbitrary file deletion vulnerability. The vulnerability exists in the `POST /api/history/getDocHistoryContent` endpoint. An attacker can craft a payload to exploit this vulnerability, resulting in the deletion of arbitrary files on the server. Commit d9887aeec1b27073bec66299a9a4181dc42969f3 fixes this vulnerability and is expected to be available in version 3.1.19.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HAffected products
Remediation
No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.
Frequently asked
Is CVE-2025-21609 being actively exploited?
CVE-2025-21609 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.60%.
How severe is CVE-2025-21609?
CVE-2025-21609 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.60% probability of exploitation.
Which products are affected by CVE-2025-21609?
Affected products include B3log Siyuan.
How do I fix CVE-2025-21609?
Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2025-21609 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.