CVE-2025-21609

moderate-risk
Published 2025-01-03

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.

Do I need to act?

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0.37% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.1/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

B3Log

References (2)

Patch https://github.com/siyuan-note/siyuan/commit/d9887aeec1b27073bec66299a9a4181dc42...
Exploit https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8fx8-pffw-w498
37
/ 100
moderate-risk
Severity 31/34 · Critical
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal