CVE-2012-4792

This vulnerability is like a “memory mistake” in an old web browser. When a person opens a malicious webpage, the browser can end up using information that was already freed, which can let an attacker run harmful code on that computer. In plain terms: clicking the wrong website can lead to malware without needing special logins.

This matters if you run Microsoft Internet Explorer 6 through 8 on the listed Windows products (for example, Windows XP Service Pack 2/3, Windows Vista Service Pack 2, Windows 7, and corresponding Windows Server versions). The attack does not require an attacker to log in to your network; it relies on a user visiting a malicious website.

You should treat it as a risk when the vulnerable Internet Explorer version is actually being used in a way that can reach the internet (or other untrusted websites).

This is RED because it’s confirmed in the CISA KEV catalog and is associated with real-world exploitation, meaning attackers have demonstrated a workable path to compromise systems. Your exposure is immediate if you’re still using Internet Explorer 6 through 8 to browse the web on those end-of-life Windows versions.

If any such systems are still connected, isolate them and move users to a supported browser while you complete the required remediation.

1. Confirm exposure (fast inventory)

   • For each workstation/server, check whether the installed browser is Internet Explorer 6, 7, or 8.
   • Also verify the underlying Windows version (e.g., Windows XP, Vista, Windows 7, and their matching Windows Server releases) to determine whether the system is end-of-life.

2. Determine your exact remediation path

   • If Microsoft provides applicable updates for your exact Windows version for CVE-2012-4792 (refer to MS13-008 / Microsoft security update guidance), apply them.
   • If the system is end-of-life and cannot be patched for your configuration, follow CISA guidance: disconnect the impacted product from the network.

3. Immediate mitigation if patching is not possible

   • Remove/disable the ability to use Internet Explorer 6–8 for everyday browsing (route users to a supported browser).
   • Disconnect end-of-life impacted systems from the network until they are patched or replaced.

4. Validate after changes

   • Confirm users no longer browse with Internet Explorer 6–8.
   • Look for signs of compromise on machines that may have visited untrusted sites (new unexpected software, unknown processes, unusual system behavior).

5. Timelines to follow

   • CISA KEV remediation due date for this issue was 2024-08-13.

6. What to monitor going forward

   • Web-browsing-related alerts (browser crashes followed by new processes, unexpected executables launched by user activity).
   • Any indicators of malware persistence that arrived after user visits to external websites.

CVE-2012-4792 is a CWE-416 use-after-free vulnerability in Microsoft Internet Explorer 6 through 8. The mechanism is memory handling within the browser that can be triggered by a specially crafted website; once triggered, it can lead to remote code execution in the context of the user (remote attackers do not need authentication).

Exploitation status: CISA lists this issue in the KEV program (added 2024-07-23), indicating confirmed real-world exploitation and requiring prioritized remediation. CISA’s required action for impacted end-of-life products is to disconnect them if still in use, with a remediation due date of 2024-08-13.

Exploit maturity: public proof-of-concept exists (noted as public PoC), and exploitation has been demonstrated in the wild (described as exploited in December 2012). Press attention has been sustained, but urgency here is driven by KEV confirmation.

EPSS: a high predicted likelihood was reported, but KEV confirmation is the primary basis for immediate action.