Improper TLS Certificate Pinning in Cyberduck and Mountain Duck
CVE-2025-41255

8HIGH

Key Information:

Vendor

Iterate Gmbh

Status
Cyberduck
Mountain Duck
Vendor
CVE Published:
25 June 2025

What is CVE-2025-41255?

Cyberduck and Mountain Duck exhibit a flaw in their handling of TLS certificate pinning, which allows the installation of untrusted certificates, including self-signed ones, into the Windows Certificate Store of the current user without adequate restrictions. This oversight poses a security risk as it may enable unauthorized access or exploitation of trusted connections.

Affected Version(s)

Cyberduck 0 <= 9.1.6

Mountain Duck 0 <= 4.17.5

References

https://github.com/sbaresearch/advisories/tree/public/202...
third-party-advisory
https://github.com/iterate-ch/cyberduck/security/advisori...
vendor-advisory

CVSS V3.1

Score:
8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thomas Kostal
Andreas Boll
.
CVE-2025-41255 : Improper TLS Certificate Pinning in Cyberduck and Mountain Duck