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CVE-2025-6434

The exception page for the HTTPS-Only feature, displayed when a website is opened via HTTP, lacked an anti-clickjacking delay, potentially allowing an attacker to trick a user into granting an exception and loading a webpage over HTTP. This vulnerability was fixed in Firefox 140 and Thunderbird 140.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:01a6521bba0816f4f1faa19f6393dc76eaccf109bfcfc2c49b8927c4c299c084
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":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/cna/affected/0

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

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"product":"Firefox","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/cna/affected/0
{"product":"Thunderbird","vendor":"Mozilla","versions":[{"lessThanOrEqual":"*","status":"unaffected","version":"140","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-1021","description":"CWE-1021 Improper Restriction of Rendered UI Layers or Frames","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

3 source assertions
{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1955182"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/cna/references/0
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-51/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/cna/references/1
{"url":"https://www.mozilla.org/security/advisories/mfsa2025-54/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ccf15eb9a7d28900971720620afa82ec72927d8dc436f88c45e2348b02b99c53 · sha256:765e9c03d723a033… · /containers/cna/references/2

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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