Vulnerability · Published Jun 25, 2025 · Assigned by sba-research
CVE-2025-41256Cyberduck and Mountain Duck - Weak Hash Algorithm for Certificate Fingerprint
High 7.4
In plain English
A high-severity security flaw in Cyberduck from iterate GmbH. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.1%top 97.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| iterate GmbH | Cyberduck | 0 – through 9.1.6 |
| iterate GmbH | Mountain Duck | 0 – through 4.17.5 |
Weakness: CWE-328 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N