CVE-2025-6435HIGH 8.1EPSS p29.2%

CVE-2025-6435CVE-2025-6435

Description

If a user saved a response from the Network tab in Devtools using the Save As context menu option, that file may not have been saved with the `.download` file extension. This could have led to the user inadvertently running a malicious executable. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.38% probability of exploitation · percentile 29.2% · 2026-06-19T12:03:05Z
Published2025-06-24
Last modified2026-04-13

Underlying weaknesses· 1

CWE-434

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1950056
  2. https://bugzilla.mozilla.org/show_bug.cgi?id=1961777
  3. https://www.mozilla.org/security/advisories/mfsa2025-51/
  4. https://www.mozilla.org/security/advisories/mfsa2025-54/

1

TypeTargetConfidenceTier
WeaknessUnrestricted Upload of File with Dangerous Typecwe-4340%live

Related by meaning· 6

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.