CVE-2025-6424 (GCVE-0-2025-6424)

Vulnerability from cvelistv5 – Published: 2025-06-24 12:27 – Updated: 2026-04-13 14:26
VLAI?
Title
Use-after-free in FontFaceSet
Summary
A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Mozilla Firefox Unaffected: 115.25 , ≤ 115.* (rpm)
Unaffected: 128.12 , ≤ 128.* (rpm)
Unaffected: 140 , ≤ * (rpm)
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    Mozilla Thunderbird Unaffected: 128.12 , ≤ 128.* (rpm)
Unaffected: 140 , ≤ * (rpm)
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Credits
LJP and HexRabbit (DEVCORE Research Team)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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