What is CVE-2025-21609?

CVE-2025-21609 is a critical-severity vulnerability in B3log Siyuan, classified under Incomplete Cleanup. CVSS score: 9.1/10. Published 2025-01-03.

How severe is CVE-2025-21609?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in B3log Siyuan

CVE-2025-21609

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.

EPSS: 0.006 (44.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

Affected products

B3log Siyuan — versions 3.1.18
Siyuan-note Siyuan — versions = 3.1.18

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-21609?: CVE-2025-21609 is a critical-severity vulnerability in B3log Siyuan, classified under Incomplete Cleanup. CVSS score: 9.1/10. Published 2025-01-03.
How severe is CVE-2025-21609?: Critical severity. CVSS v3 base score is 9.1 out of 10.