CVE-2025-41256

Cyberduck and Mountain Duck - Weak Hash Algorithm for Certificate Fingerprint

State: Published
Severity: 7.4 High
Published: Jun 25, 2025
Updated: Jun 25, 2025
Reserved: Apr 16, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	sba-research

Weaknesses

CWE-328 Use of Weak Hash

Affected Products

Product	Versions
Cyberduckiterate GmbH	9.1.6 and earlierAffected
Mountain Duckiterate GmbH	4.17.5 and earlierAffected

References

https://github.com/sbaresearch/advisories/tree/public/2025/SBA-ADV-20250325-02_Cyberduck_Mountain_Duck_Weak_Hashthird-party-advisory
https://github.com/iterate-ch/cyberduck/security/advisories/GHSA-688c-vjrc-84rvvendor-advisory

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