CVE-2016-1966: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 2.9% chance of exploitation in the next 30 days.

The nsNPObjWrapper::GetNewOrUsed function in dom/plugins/base/nsJSNPRuntime.cpp in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code or cause a denial of service (invalid pointer dereference and memory corruption) via a crafted NPAPI plugin.

Affected products

• Mozilla Firefox: up to and including 44.0.2; version 38.0 only; version 38.0.1 only; version 38.0.5 only; version 38.1.0 only; version 38.1.1 only; …
• Mozilla Thunderbird: up to and including 38.6.0
• Opensuse Opensuse: version 13.1 only
• Oracle Linux: version 5.0 only; version 6 only; version 7 only

Published 2016-03-13. Last modified 2026-06-17.