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CVE-2025-41255— Cyberduck and Mountain Duck - Improper Certificate Store Handling

Quick assessment

Affected
iterate GmbH Cyberduck
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

iterate Cyberduck和iterate Mountain Duck都是iterate开源的一款文件传输客户端。 iterate Cyberduck 9.1.6及之前版本和iterate Mountain Duck 4.17.5及之前版本存在安全漏洞，该漏洞源于TLS证书固定处理不当，可能导致安装不受信任证书。

CVSS 8.0 · High EPSS 0.19% · P8
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I. Basic Information for CVE-2025-41255

Vulnerability Information
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Vulnerability Title
Cyberduck and Mountain Duck - Improper Certificate Store Handling
Source: CVE Program / CVE List V5
Vulnerability Description
Cyberduck and Mountain Duck improperly handle TLS certificate pinning for untrusted certificates (e.g., self-signed), unnecessarily installing it to the Windows Certificate Store of the current user without any restrictions. This issue affects Cyberduck through 9.1.6 and Mountain Duck through 4.17.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5
Vulnerability Title
iterate Cyberduck和iterate Mountain Duck 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
iterate Cyberduck和iterate Mountain Duck都是iterate开源的一款文件传输客户端。 iterate Cyberduck 9.1.6及之前版本和iterate Mountain Duck 4.17.5及之前版本存在安全漏洞，该漏洞源于TLS证书固定处理不当，可能导致安装不受信任证书。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
iterate GmbH Cyberduck 0 ~ 9.1.6 -
iterate GmbH Mountain Duck 0 ~ 4.17.5 -

II. Public POCs for CVE-2025-41255

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8199 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2025-41255

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Vendor Advisories for CVE-2025-41255 (1)

IV. Related Vulnerabilities

Same product: Cyberduck
Same vendor: iterate GmbH
Same weakness: CWE-266

V. Comments for CVE-2025-41255

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