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CVE-2025-6435

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:31b02ccad319a7ea94d6fe7b5c0d8855da63226b7dad60e141434f483e56e5fb
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/affected/1

{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/affected/1
{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-434","description":"CWE-434 Unrestricted Upload of File with Dangerous Type","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

4 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1950056"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/references/0
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1961777"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-51/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/references/2
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-54/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1d3814c0dc63f212b067a2faf32faa6910c0a2561f74eebcaebaa33f5a1d538 · sha256:8e5659320f3c8467… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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