CVE-2025-4919HIGH 8.8EPSS p92.1%
CVE-2025-4919CVE-2025-4919
Description
An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.
Scoring
| CVSS 3.1 | 8.8 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| EPSS | 5.77% probability of exploitation · percentile 92.1% · 2026-06-19T12:03:05Z |
| Published | 2025-05-17 |
| Last modified | 2026-04-13 |
Underlying weaknesses· 2
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1966614
- https://www.mozilla.org/security/advisories/mfsa2025-36/
- https://www.mozilla.org/security/advisories/mfsa2025-37/
- https://www.mozilla.org/security/advisories/mfsa2025-38/
- https://www.mozilla.org/security/advisories/mfsa2025-40/
- https://www.mozilla.org/security/advisories/mfsa2025-41/
- https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00046.html
2
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Out-of-bounds Readcwe-125 | 0% | live |
| Weakness | Out-of-bounds Writecwe-787 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.