CVE-2024-4947: Google Chromium V8 Type Confusion Vulnerability

CVE-2024-4947 is a type confusion vulnerability in Google Chromium's V8 JavaScript engine. A remote attacker can trigger it by delivering a crafted HTML page, potentially achieving code execution in the context of the browser process. This matters because Chromium and V8 power many widely used browsers and Electron-based applications; successful exploitation can give an attacker a foothold on an endpoint without requiring additional user interaction beyond visiting or rendering the page.

Defenders should treat this as a high-priority browser engine flaw. Confirm exact impact, fixed builds, and any platform-specific notes against the vendor advisory, as public detail beyond the CISA summary is limited.

How it works

The weakness is classified as CWE-843 (Type Confusion). In engines such as V8, objects are expected to conform to specific internal type representations. When type checks or assumptions fail, code that later operates on the object may interpret memory incorrectly. An attacker who can control the HTML and associated JavaScript can craft objects that confuse the engine's type system, leading to memory corruption that can be leveraged for arbitrary code execution.

No exploit code or detailed mechanics are provided in the available facts. Exploitation requires the victim to process a malicious page; the attack surface is therefore any Chromium-based renderer that loads untrusted content. Confirm the precise abuse path and any required conditions against the vendor advisory.

Am I affected? How to find it in your systems

Google Chromium V8 is the JavaScript engine used by Chromium and browsers built on it (including Google Chrome and many derivatives). It also appears in applications that embed Chromium or Electron. Inventory all browser installations and Electron apps across endpoints, servers that host browser-based tools, and managed devices.

• Query software inventory or endpoint management tools for Chromium, Chrome, Edge, Brave, Opera, and other Chromium-based products, plus any Electron applications.
• Record the installed browser and V8-related version strings; compare them to the fixed versions listed in the vendor advisory.
• Check for non-standard or outdated browser packages on developer workstations, kiosks, and virtual desktop infrastructure.
• Review proxy, web gateway, or EDR logs for anomalous JavaScript-heavy page loads or renderer crashes that coincide with untrusted domains; such signals are not definitive but can indicate probing.

If version information is unavailable or the product is no longer supported, treat the instance as potentially affected until confirmed otherwise.

How to remediate

Apply the vendor-supplied update that addresses CVE-2024-4947 as the primary remediation. CISA's required action is to apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. After patching, verify that the new build is present across the estate and that automatic update mechanisms are functioning.

• Deploy the Chromium or browser update through your standard patch management process, prioritizing internet-facing and high-privilege users.
• For embedded or Electron applications, obtain and apply the corresponding updated package from the application vendor.
• Re-enable any temporary hardening only after confirming the patch is active, then re-test critical workflows.

Hardening steps that reduce the impact of similar type-confusion flaws include keeping browsers in the most recent stable channel, enabling site isolation and sandboxing features where available, and restricting the ability of unprivileged users to install alternate browsers.

If you can't patch immediately

Until the vendor update can be applied, reduce exposure with compensating controls focused on the browser attack surface.

• Segment high-risk user groups (finance, administrators, developers) so that browser traffic is isolated and monitored more closely.
• Use a web application firewall or secure web gateway to block or sandbox known malicious or uncategorized sites; virtual patching signatures for this class of flaw may become available from security vendors—validate them against the advisory.
• Where operationally feasible, enforce stricter Content Security Policy or disable unnecessary JavaScript for high-risk sites via enterprise browser policies.
• Increase logging and EDR detection for renderer process crashes, unexpected child processes spawned by the browser, and outbound connections from browser processes to unusual destinations.
• If the product cannot be mitigated, discontinue its use for sensitive activities until a fixed version is available.

These measures lower likelihood and impact but do not eliminate the vulnerability; schedule patching as soon as possible.

If your data may have been exposed

Actively exploited browser vulnerabilities can lead to endpoint compromise and subsequent data theft. Known ransomware use of this CVE is not documented. If you suspect exploitation, isolate affected hosts, collect forensic artifacts, and review for lateral movement or credential access. As a routine check, users can run a free exposure scan of their email addresses against known breach data to determine whether credentials or personal information have already appeared in public dumps.