CVE-2016-1930

What it actually does

Unspecified memory corruption in the browser engine allows remote attackers to trigger application crashes or execute arbitrary code.

Why it matters to the business

Attackers can gain full control of affected user systems through web content, risking data theft, malware deployment, and loss of user trust on unpatched browsers still in use.

How an attack unfolds

An attacker crafts malicious web content that triggers memory corruption flaws in the browser engine when rendered, leading to crashes or arbitrary code execution without user interaction beyond visiting the page.

How to fix it

Upgrade Mozilla Firefox to version 44.0 or later and Firefox ESR to 38.6 or later. Remove or isolate legacy installations that cannot be updated.

How to confirm the fix worked

Verify installed browser versions against the fixed releases; test rendering of known triggering content in isolated environments to confirm stability.

Typical attack path

1. Attacker hosts or compromises a website delivering specially crafted HTML, JavaScript, or media.
2. Victim browser loads the content and processes it in the vulnerable engine.
3. Memory corruption occurs, allowing control-flow hijacking or denial of service.
4. Attacker executes arbitrary code or crashes the application.

How to detect it

Review browser crash logs and process termination events for patterns coinciding with web requests; correlate with network logs showing visits to suspicious domains around the time of instability.

What your security team should do

• Immediately inventory all Firefox deployments and prioritize upgrades to 44.0+ or ESR 38.6+.
• Block or sandbox unpatched browser traffic from high-risk user populations.
• Monitor for browser crashes correlated with web activity as a potential indicator of exploitation attempts.