CVE-2015-4489: The nsTArray_Impl class in Mozilla Firefox before 40.0, Firefox ESR 38.x before 38.2, and Firefox OS before...

Security readout for executives and security teams

This is an older Mozilla memory-corruption issue in Firefox, Firefox ESR, and Firefox OS. A malicious web interaction could crash the browser and may have had other unspecified effects. The sources identify fixed release thresholds, but do not provide CVSS scoring or confirmed exploitation. Business urgency is mainly for legacy systems still running affected versions. Exposure is most plausible on legacy desktops, servers, kiosks, or embedded/mobile environments retaining old Firefox, Firefox ESR, Firefox OS, or distribution-packaged Mozilla builds from 2015. Current supported browsers are unlikely to be exposed if patched through normal vendor channels. Treat this as a legacy hygiene issue unless affected versions remain in production. Prioritize remediation on systems that browse external content, run kiosks, or cannot receive normal browser updates. Mitigation focus: Upgrade Firefox to 40.0 or later where applicable.; Upgrade Firefox ESR 38.x to 38.2 or later.; Retire or isolate unsupported Firefox OS devices before 2.2..

Prepared

Jun 13, 2026, 22:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.