CVE-2022-0511

What it actually does

Multiple memory safety bugs in Firefox 96 result in memory corruption that can be leveraged for arbitrary code execution.

Why it matters to the business

Attackers could gain control of affected user systems through the browser, enabling theft of credentials, installation of malware, or lateral movement inside the organization; the issue has been public for over three years with no known ransomware use but still requires immediate attention due to its age and prevalence in the browser ecosystem.

How an attack unfolds

An attacker hosts or compromises a web page that triggers one of the memory corruption bugs when rendered in a vulnerable Firefox instance; with sufficient effort the corruption can be turned into arbitrary code execution inside the browser process, allowing the attacker to run chosen payloads without user interaction beyond visiting the page.

How to fix it

Upgrade all Firefox installations to version 97 or later; enforce automatic updates where possible and verify version numbers centrally.

How to confirm the fix worked

Query endpoint management or browser inventory tools to confirm no instances remain below version 97; re-scan after the update window to ensure exposure is eliminated.

Typical attack path

1. Host or compromise a web page containing the trigger for the memory safety bugs
2. Lure users to the page via phishing, malvertising, or compromised sites
3. Page loads in vulnerable Firefox version and triggers memory corruption
4. Exploit payload gains arbitrary code execution inside the browser
5. Attacker installs malware, steals data, or pivots to other systems

How to detect it

Examine browser process creation logs, EDR telemetry for unexpected child processes spawned by firefox.exe, and network logs for connections to previously unknown domains around the time of page visits; no public exploitation artifacts are known.

What your security team should do

• Immediately push Firefox 97+ to all managed endpoints and block older versions via policy
• Monitor browser update compliance dashboards for the next 30 days
• Review web proxy or EDR logs for any post-publication suspicious activity originating from Firefox processes