CVE-2025-4919
PUBLISHEDOut-of-bounds access when optimizing linear sums
Recommended Action
Track for updates. Assess relevance to your asset inventory and enrichment workflows.
At a Glance
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.
- CVE Published
- May 17, 2025
- —
- —
- CVSS
- —
- EPSS
- —
CVE 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/
Recommended Actions
- Track for updates. Assess relevance to your asset inventory and enrichment workflows.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users via the Pro API.
Learn About Virtual PatchesTimeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
21:07 UTC about 1 year ago21:07 UTC · about 1 year ago
CVE published
Vulnerability disclosed publicly
-
19:40 UTC about 1 year ago19:40 UTC · about 1 year ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2025-4919
{
"cve_id": "CVE-2025-4919",
"title": "Out-of-bounds access when optimizing linear sums",
"affected_vendor": "Mozilla",
"affected_product": "Firefox, Thunderbird",
"confidence": null,
"cvss_score": null,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": false,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}