CVE-2010-0249: Microsoft Internet Explorer Use-After-Free Vulnerability

This vulnerability is a use-after-free flaw in Microsoft Internet Explorer that lets a remote attacker execute arbitrary code by referencing a pointer to an object that has already been deleted. It matters because successful exploitation grants the attacker control over the affected system, and the product may be end-of-life or end-of-service, leaving no vendor support.

How it works

The weakness is classified as CWE-416, use-after-free. An attacker supplies specially crafted content that causes Internet Explorer to free an object while a reference to it remains. Subsequent access to that dangling pointer can corrupt memory and allow arbitrary code execution. No further mechanics are provided in the available record; confirm exact trigger conditions against the vendor advisory.

Am I affected? How to find it in your systems

Microsoft Internet Explorer runs on Windows endpoints and servers wherever users browse the web with that browser. Inventory installations through standard software asset management tools or configuration management databases. Check for any remaining instances of the product and note that it may be end-of-life or end-of-service. Review web proxy or endpoint logs for unusual navigation to untrusted sites or unexpected script execution, though specific indicators of compromise must be validated against current threat intelligence.

How to remediate

Apply mitigations exactly as stated in the vendor advisory. Because the product may be end-of-life or end-of-service, the recommended action is to discontinue its use. Follow any applicable BOD 22-01 guidance for cloud services that still rely on the affected component.

If you can't patch immediately

Remove or disable Internet Explorer where feasible. Apply network segmentation to limit browser traffic from high-risk systems. Monitor endpoint and network telemetry for signs of unexpected code execution. If mitigations cannot be applied, discontinue use of the product.

If your data may have been exposed

Actively exploited vulnerabilities of this class have led to breaches. Run a free exposure scan of organizational email addresses against known breach data to determine whether credentials or other information have already appeared in public records.