CVE-2024-43489 Overview
CVE-2024-43489 is a remote code execution vulnerability in Microsoft Edge (Chromium-based). The flaw is categorized under [CWE-843] Type Confusion, where the browser interprets a resource as a type incompatible with its actual data layout. An attacker can exploit this condition by luring a victim to a malicious web page, leading to arbitrary code execution in the context of the browser process.
Critical Impact
Successful exploitation allows attackers to execute arbitrary code on the victim's system after a single user interaction with a crafted web page, compromising confidentiality, integrity, and availability.
Affected Products
- Microsoft Edge (Chromium-based)
- Versions prior to the September 2024 security update
- All supported desktop platforms running Edge Chromium
Discovery Timeline
- 2024-09-19 - CVE-2024-43489 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-43489
Vulnerability Analysis
The vulnerability resides in Microsoft Edge's Chromium-based rendering engine. It is a type confusion weakness, where code accesses an object using an incompatible type definition. Attackers who control web content can manipulate engine internals to trigger this mismatch.
Exploitation occurs over the network and requires user interaction, typically a victim visiting a crafted page. The scope remains unchanged, but successful exploitation yields high impact on confidentiality, integrity, and availability. The EPSS probability sits at 0.717%, indicating measurable interest among threat actors.
No public proof-of-concept has been released, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Microsoft Security Update CVE-2024-43489 advisory for vendor-supplied technical context.
Root Cause
The root cause is improper type handling [CWE-843] in the browser engine. When attacker-controlled JavaScript or web content causes the engine to assume one object type while the underlying memory contains another, control-flow data and pointers can be misinterpreted. This mismatch enables corruption of in-process state and redirection of execution.
Attack Vector
The attack vector is network-based with low complexity and no privileges required. A victim must navigate to or render attacker-controlled content. After interaction, the malicious page triggers the type confusion to execute code inside the browser's renderer or main process, depending on sandbox boundaries.
No verified exploitation code is publicly available. Technical details are described in prose; consult the vendor advisory for engine-specific information.
Detection Methods for CVE-2024-43489
Indicators of Compromise
- Unexpected child processes spawned by msedge.exe, such as command shells or scripting hosts
- Browser crashes followed by anomalous outbound network connections to unfamiliar domains
- Creation of executable files in user-writable paths shortly after browsing activity
Detection Strategies
- Monitor process lineage for msedge.exe parenting non-browser processes like cmd.exe, powershell.exe, or rundll32.exe
- Alert on anomalous memory allocations or renderer crashes that correlate with newly accessed URLs
- Correlate browser navigation telemetry with subsequent file writes or persistence mechanism creation
Monitoring Recommendations
- Inventory Microsoft Edge versions across the fleet and flag any below the September 2024 security update
- Track DNS and proxy logs for navigation to newly registered or low-reputation domains preceding browser crashes
- Enable enhanced endpoint telemetry on browser process trees, including command-line arguments and loaded modules
How to Mitigate CVE-2024-43489
Immediate Actions Required
- Apply the Microsoft Edge security update referenced in the Microsoft Security Update CVE-2024-43489 advisory
- Verify that Edge auto-update is enabled and the browser has restarted to load the patched binaries
- Block known malicious domains at the perimeter and enforce SmartScreen or equivalent web filtering
Patch Information
Microsoft has released a security update for Edge (Chromium-based) addressing this vulnerability. Administrators should consult the Microsoft Security Update CVE-2024-43489 advisory for the fixed version applicable to their channel and deploy it across all managed endpoints.
Workarounds
- Restrict browsing to trusted sites using enterprise group policy until patching is verified
- Disable JavaScript on untrusted zones where feasible to reduce the exploitation surface
- Enforce least-privilege user accounts so that any code execution within the browser inherits limited rights
# Verify Microsoft Edge version on Windows endpoints
reg query "HKLM\SOFTWARE\Microsoft\Edge\BLBeacon" /v version
# Force Edge update via command line
"%ProgramFiles(x86)%\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ua /installsource scheduler
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
