CVE-2025-41255 Cyberduck and Mountain Duck - Improper Certificate Store Handling
Attackers can bypass TLS certificate pinning by exploiting improper handling of untrusted certificates in Cyberduck and Mountain Duck.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-41255?
CVE-2025-41255 is a high-severity vulnerability in iterate GmbH Cyberduck, published on 25 Jun 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Cyberduck and Mountain Duck improperly handle TLS certificate pinning for untrusted certificates (e.g., self-signed), unnecessarily installing it to the Windows Certificate Store of the current user without any restrictions.
This issue affects Cyberduck through 9.1.6 and Mountain Duck through 4.17.5.
Weakness: CWE-266
Which versions are affected by CVE-2025-41255?
How do I fix CVE-2025-41255?
No fix has been published for CVE-2025-41255 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-41255 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-41255 exists.
Sources
Also known as GHSA-vjjc-grpp-m655, GHSA-wxfx-h38m-cr9x.