How severe is CVE-2025-41256?

CVE-2025-41256 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2025-41256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-41256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-41256 have an EU (EUVD) identifier?

Yes. CVE-2025-41256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19095.

When was CVE-2025-41256 published?

CVE-2025-41256 was published on 2025-06-25 and last updated on 2026-06-17.

CVE-2025-41256

CVE-2025-41256 is a high-severity vulnerability with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-328.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-19095
Weakness: CWE-328
Published: 2025-06-25
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-41256?: 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.
How severe is CVE-2025-41256?: CVE-2025-41256 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2025-41256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-41256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-41256 have an EU (EUVD) identifier?: Yes. CVE-2025-41256 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19095.
When was CVE-2025-41256 published?: CVE-2025-41256 was published on 2025-06-25 and last updated on 2026-06-17.

References

Other CWE-328 vulnerabilities

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