CVE-2025-4083
Published: 29 April 2025
Summary
CVE-2025-4083 is a critical-severity Improper Isolation or Compartmentalization (CWE-653) vulnerability in Mozilla Firefox. Its CVSS base score is 9.1 (Critical).
Operationally, ranked at the 44.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-12730
Vulnerability details
A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox…
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138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Defines isolation boundaries by specifying which external systems may access or process organization data.
Maintains isolation and compartmentalization by restricting flows between security domains or levels.
Reviewing the continued need for connections supports isolation and compartmentalization.
Locating systems away from hazards improves isolation and compartmentalization from external physical or environmental threats.
The CONOPS must articulate isolation and compartmentalization expectations for security and privacy, making architectural failures in separation of duties or domains harder to overlook.
Security architectures commonly incorporate isolation and compartmentalization strategies to limit the impact of compromises.
Organization-wide privacy program leadership ensures proper isolation and compartmentalization of personal data.
Oversight ensures data-matching activities maintain required isolation between distinct data sets and authorized user communities.