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CVE-2025-41256— Cyberduck and Mountain Duck - Weak Hash Algorithm for Certificate Fingerprint

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，该漏洞源于使用SHA-1存储证书指纹，可能导致安全风险。

CVSS 7.4 · High EPSS 0.13% · P2
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I. Basic Information for CVE-2025-41256

Vulnerability Information
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Vulnerability Title
Cyberduck and Mountain Duck - Weak Hash Algorithm for Certificate Fingerprint
Source: CVE Program / CVE List V5
Vulnerability Description
Cyberduck and Mountain Duck improper handle TLS certificate pinning for untrusted certificates (e.g., self-signed), since the certificate fingerprint is stored as SHA-1, although SHA-1 is considered weak. This issue affects Cyberduck: through 9.1.6; Mountain Duck: through 4.17.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可逆的单向哈希
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，该漏洞源于使用SHA-1存储证书指纹，可能导致安全风险。
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-2025-41256

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9210 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-2025-41256

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Vendor Advisories for CVE-2025-41256 (1)

IV. Related Vulnerabilities

Same product: Cyberduck
Same vendor: iterate GmbH
Same weakness: CWE-328

V. Comments for CVE-2025-41256

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