iterate Cyberduck/Mountain Duck TLS Certificate weak hash

Summaryinfo

A vulnerability labeled as problematic has been found in iterate Cyberduck and Mountain Duck. The impacted element is an unknown function of the component TLS Certificate Handler. The manipulation results in weak hash. This vulnerability was named CVE-2025-41256. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in iterate Cyberduck and Mountain Duck (the affected version unknown). Affected is an unknown part of the component TLS Certificate Handler. The manipulation with an unknown input leads to a weak hash vulnerability. CWE is classifying the issue as CWE-328. The product uses an algorithm that produces a digest (output value) that does not meet security expectations for a hash function that allows an adversary to reasonably determine the original input (preimage attack), find another input that can produce the same hash (2nd preimage attack), or find multiple inputs that evaluate to the same hash (birthday attack). This is going to have an impact on integrity. CVE summarizes:

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.

The weakness was presented by Andreas Boll. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-41256 since 04/16/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.001.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-19095). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• iterate

Name

• Cyberduck
• Mountain Duck

CPE 2.3info

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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