CVE-2024-43587: Microsoft Edge Chromium RCE Vulnerability

CVE-2024-43587 Overview

CVE-2024-43587 is a remote code execution vulnerability affecting Microsoft Edge (Chromium-based). Microsoft published the advisory on October 17, 2024. The flaw is tracked under [CWE-122] (Heap-based Buffer Overflow), indicating a memory corruption issue in the browser's handling of untrusted content.

An attacker who successfully exploits this vulnerability can execute arbitrary code in the context of the affected browser process. The vulnerability requires no privileges and no user interaction, but the attack complexity is high.

Critical Impact
Successful exploitation allows attackers to execute arbitrary code on systems running vulnerable Microsoft Edge Chromium builds, leading to full compromise of browser confidentiality, integrity, and availability.

Affected Products

Microsoft Edge (Chromium-based) prior to the October 2024 security update
Windows endpoints running unpatched Edge Chromium builds
Enterprise deployments managed through Microsoft Edge update channels

Discovery Timeline

2024-10-17 - CVE-2024-43587 published to the National Vulnerability Database
2024-10-17 - Microsoft released the security advisory for CVE-2024-43587
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-43587

Vulnerability Analysis

The vulnerability is classified under [CWE-122] as a heap-based buffer overflow within Microsoft Edge Chromium. Heap-based overflows occur when a program writes past the boundary of a dynamically allocated heap buffer. In a browser context, this typically happens during parsing or rendering of untrusted web content.

The issue is network-reachable through standard browsing activity. An attacker hosts a crafted web resource and lures a target into loading it. When the browser processes the malicious content, the overflow corrupts adjacent heap structures. With reliable heap grooming, this corruption can be steered into control of execution flow.

Microsoft has not released detailed root cause information. The vendor advisory categorizes the flaw as remote code execution and indicates no public exploitation at this time. The EPSS probability is 0.878%, reflecting moderate predicted exploitation interest.

Root Cause

The root cause is improper bounds checking on a heap-allocated buffer within the Edge Chromium codebase. Memory safety errors of this class commonly originate in C/C++ rendering, parsing, or JavaScript engine code paths that handle attacker-controlled input sizes.

Attack Vector

The attack vector is network-based. A target user navigates to an attacker-controlled site or loads attacker-controlled content embedded in a compromised site. No authentication is required. The high attack complexity reflects the need for reliable heap shaping and bypass of mitigations such as Address Space Layout Randomization (ASLR) and Control Flow Guard (CFG).

For technical specifics, refer to the Microsoft CVE-2024-43587 Advisory.

Detection Methods for CVE-2024-43587

Indicators of Compromise

Unexpected child processes spawned by msedge.exe, especially command interpreters such as cmd.exe, powershell.exe, or wscript.exe
Crashes or repeated unexpected restarts of msedge.exe correlated with browsing activity
Outbound connections from Edge renderer processes to uncategorized or newly registered domains
Writes to %TEMP%, %APPDATA%, or startup locations originating from the Edge process tree

Detection Strategies

Hunt for process lineage anomalies where msedge.exe is the parent of script interpreters or LOLBins
Monitor Edge version telemetry across managed endpoints to identify hosts running pre-patch builds
Correlate browser crash events with subsequent network or file system activity from the same process
Apply behavioral identification rules for heap exploitation patterns and post-exploitation execution

Monitoring Recommendations

Collect endpoint process, file, and network telemetry into a centralized data lake for retrospective hunting
Track Microsoft Edge version compliance against the October 2024 cumulative update baseline
Alert on Edge processes loading unsigned modules or performing memory allocations consistent with shellcode staging
The SentinelOne Singularity Endpoint behavioral AI engine identifies post-exploitation activity originating from browser processes, supporting identification of exploitation attempts against this class of vulnerability.

How to Mitigate CVE-2024-43587

Immediate Actions Required

Apply the Microsoft Edge security update referenced in the Microsoft CVE-2024-43587 Advisory to all managed endpoints
Verify the installed Edge version using edge://settings/help and confirm it is at or above the patched build
Enforce automatic browser updates through Group Policy or Microsoft Intune across the enterprise fleet
Prioritize patching for high-risk users such as administrators, developers, and executives

Patch Information

Microsoft released a security update for Microsoft Edge (Chromium-based) addressing CVE-2024-43587 on October 17, 2024. Administrators should consult the Microsoft CVE-2024-43587 Advisory for the exact fixed version and deployment guidance.

Workarounds

Restrict access to untrusted websites through web filtering and DNS security controls
Enable Microsoft Defender SmartScreen and Enhanced Security Mode in Edge to reduce exposure to malicious content
Apply application control policies to limit child process creation from browser executables
Segment high-risk browsing into isolated environments such as Windows Sandbox or Application Guard until patches are deployed

bash

# Verify Microsoft Edge version on Windows endpoints
reg query "HKLM\SOFTWARE\Microsoft\Edge\BLBeacon" /v version

# Force update check via Edge management URL
start msedge --url=edge://settings/help