CVE-2025-6425

Summary

An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

CVE Program Container

Additional References

• https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html
• https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1717672
• https://www.mozilla.org/security/advisories/mfsa2025-51/
• https://www.mozilla.org/security/advisories/mfsa2025-52/
• https://www.mozilla.org/security/advisories/mfsa2025-53/
• https://www.mozilla.org/security/advisories/mfsa2025-54/
• https://www.mozilla.org/security/advisories/mfsa2025-55/

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