Critical Security Vulnerabilities fixed in Firefox 72.0.1 and Firefox ESR 68.4.1

Mozilla released Firefox 72.0.1 and Firefox ESR 68.4.1 versions to patch a critical zero-day vulnerability in its browser that is being actively exploited in the wild.

The critical 0-Day vulnerability, tracked as CVE-2019-17026, has been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), which could allow for arbitrary code execution.

The vulnerability impacts IonMonkey, which is a JavaScript JIT compiler for SpiderMonkey, the main component at Firefox's core that handles JavaScript operations (Firefox's JavaScript engine).

The vulnerability was categorized as a "type confusion", which is a memory bug where a memory input is initially allocated as one type but gets switched to another type during manipulation, causing unexpected consequences to data processing, including the ability to execute code on a vulnerable system.

Systems Affected:

Firefox versions prior to 72.0.1

Firefox ESR versions prior to 68.4.1

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