CVE-2025-41255

HIGHNVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

Score 8.0 from GitHub Security Advisory (severity: HIGH) published 2025-06-26. NVD baseline CVSS 8.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.0EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.0Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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.

CVSS v3
8.0
EG Score
8.0HIGHmedium confidence
EG Risk
52
EG Risk 52/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity80% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

Published

June 25, 2025

Last Modified

April 15, 2026

Advisory Details (2)

Auto-updated Sep 21, 2026
🔬 Proof of concept available. No fix on record yet. Sources: github.
genericMentions a patch (unverified)🟡 PoC Available

advisories/2025/SBA-ADV-20250325-01_Cyberduck_Mountain_Duck_Certificate_Handling at public · sbaresearch/advisories · GitHub

https://github.com/sbaresearch/advisories/tree/public/2025/SBA-ADV-20250325-01_Cyberduck_Mountain_Duck_Certificate_Handling
githubMentions a patch (unverified)🟡 PoC Available

Cyberduck and Mountain Duck - Improper Certificate Store Handling · Advisory · iterate-ch/cyberduck · GitHub

https://github.com/iterate-ch/cyberduck/security/advisories/GHSA-vjjc-grpp-m655

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 189 total refreshes for this CVE.

  1. 2026-10-09 20:06 UTCEPSS rescore
  2. 2026-10-08 17:09 UTCEPSS rescore
  3. 2026-10-07 23:46 UTCEPSS rescore
  4. 2026-10-06 17:55 UTCOSV refresh
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  20. 2026-09-16 23:06 UTCOSV refresh
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  1. 2026-09-11 09:35 UTCEPSS rescore
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  9. 2026-08-30 19:16 UTCEPSS rescore
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  11. 2026-08-28 23:13 UTCOSV refresh
  12. 2026-08-28 21:40 UTCEPSS rescore
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  26. 2026-08-13 21:59 UTCEPSS rescore
  27. 2026-08-12 13:50 UTCEPSS rescore
  28. 2026-08-12 10:40 UTCOSV refresh
  29. 2026-08-09 13:46 UTCEPSS rescore
  30. 2026-08-08 16:36 UTCEPSS rescore
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  40. 2026-07-28 15:35 UTCEPSS rescore
  41. 2026-07-27 17:57 UTCOSV refresh
  42. 2026-07-26 14:54 UTCEPSS rescore
  43. 2026-07-25 14:17 UTCEPSS rescore
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  45. 2026-07-24 14:17 UTCEPSS rescore
  46. 2026-07-23 02:55 UTCEG score recompute
  47. 2026-07-22 14:07 UTCEPSS rescore
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  50. 2026-07-20 17:07 UTCEPSS rescore
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  66. 2026-07-10 10:52 UTCOSV refresh
  67. 2026-07-09 19:09 UTCEPSS rescore
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  70. 2026-07-06 16:27 UTCEPSS rescore
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  74. 2026-07-01 15:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-41255?
CVE-2025-41255 is a high vulnerability published on June 25, 2025. 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…
When was CVE-2025-41255 disclosed?
CVE-2025-41255 was first published on June 25, 2025, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-41255 actively exploited?
CVE-2025-41255 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-41255?
CVE-2025-41255 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2025-41255?
No fix for CVE-2025-41255 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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