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CVE-2025-0240Compartment mismatch when parsing JavaScript JSON module
- 4.0MediumCVSS base score
- 0.67%Exploitation in 30 daysEPSS · top 47% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
Timeline
ID reserved
By mozilla
- 1 day later
· 1 day later
Published
- 15 months later
· 15 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium4.0 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVDNVD · Modified | 3.1 | Medium4.0 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.67% · top 47% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.0.
Affected products
- unaffected 128.6 – ≤ 128.*
- unaffected 134 – ≤ *
- unaffected 128.6 – ≤ 128.*
- unaffected 134 – ≤ *
References
References6
- https://bugzilla.mozilla.org/show_bug.cgi?id=1929623 (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-01/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-02/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-04/ (opens in a new tab)
- https://www.mozilla.org/security/advisories/mfsa2025-05/ (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00004.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-1572 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-0240)Record last updated .