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TI-2025-27501 Aliases CVE-2025-41255GHSA-wxfx-h38m-cr9x

Cyberduck and Mountain Duck - Improper Certificate Store Handling

Priority HIGH 70CWE-266Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-266.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00187 8th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
iterate GmbHCyberduckup to 9.1.6—No fix listedCNA
iterate GmbHMountain Duckup to 4.17.5—No fix listedCNA
  • Cyberduck Vendoriterate GmbH Affected up to 9.1.6 Fixed in — No fix listed CNA
  • Mountain Duck Vendoriterate GmbH Affected up to 4.17.5 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-41255
  2. 2026-10-03 Alias added: GHSA-wxfx-h38m-cr9x

References

Advisory 2

  • TI-2025-27502 Cyberduck and Mountain Duck - Weak Hash Algorithm for Certificate Fingerprint CVSS 3.1HIGH 7.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences