CVE-2025-41256

HIGH

Cyberduck <9.1.6 - Mountain Duck <4.17.5 - TLS Pinning Weakness

Title source: llm

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.

References (2)

[Various Sources] https://github.com/sbaresearch/advisories/tree/public/2025/SBA-ADV-20250325-02_Cyberduck_Mountain_Duck_Weak_Hash

View Writeup ZIP pw:eip

[Vendor Advisory] https://github.com/iterate-ch/cyberduck/security/advisories/GHSA-688c-vjrc-84rv

Scores

CVSS v3 7.4

EPSS 0.0007

EPSS Percentile 21.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-328

Status published

Products (2)

iterate GmbH/Cyberduck < 9.1.6

iterate GmbH/Mountain Duck < 4.17.5

Published Jun 25, 2025

Tracked Since Feb 18, 2026