CVE-2024-43577 Overview
CVE-2024-43577 is a spoofing vulnerability in Microsoft Edge (Chromium-based). The flaw is categorized under [CWE-449] (The UI Performs the Wrong Action) and allows an attacker to manipulate what the browser displays to a user. Successful exploitation requires user interaction, typically the user visiting a crafted webpage or interacting with a malicious element in the browser interface. The vulnerability affects the confidentiality boundary between trusted and untrusted content by enabling deceptive UI presentations that can facilitate phishing, credential theft, or content misrepresentation.
Critical Impact
Attackers can craft web content that misleads users about the origin or authenticity of displayed information, enabling downstream social engineering attacks against Microsoft Edge users.
Affected Products
- Microsoft Edge (Chromium-based) prior to the October 2024 security update
- Windows, macOS, and Linux builds distributed through Microsoft's release channels
- Enterprise deployments managed via Microsoft Edge for Business
Discovery Timeline
- 2024-10-18 - CVE-2024-43577 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-43577
Vulnerability Analysis
The vulnerability resides in how Microsoft Edge presents information to users through its browser interface. Under [CWE-449], the browser performs an action that does not match the user's expectation, enabling spoofed content to appear legitimate. An attacker leverages this mismatch to display misleading URLs, security indicators, or UI elements.
Exploitation requires a network-based attack vector combined with user interaction. The target user must visit an attacker-controlled page or interact with malicious content rendered inside Edge. No authentication is required on the attacker's side, which lowers the barrier for wide-scale phishing campaigns.
The integrity impact is limited to modification of what the user perceives in the browser. Confidentiality and availability of the underlying system remain intact, but the spoofed presentation can facilitate secondary attacks such as credential harvesting or malware delivery when combined with social engineering.
Root Cause
The root cause is improper alignment between the action Edge performs and the visual cue displayed to the user. This UI redressing weakness lets attacker-controlled content influence trust indicators. Microsoft has not publicly disclosed the specific component responsible.
Attack Vector
An attacker hosts a crafted webpage or delivers malicious content through advertising networks, compromised sites, or phishing links. When the victim opens the content in a vulnerable Edge build, the browser renders elements that misrepresent origin, security state, or interactive controls. The user then acts on the false representation, exposing credentials or authorizing unintended actions.
The vulnerability manifests in Edge's rendering and UI presentation layer. Refer to the Microsoft CVE-2024-43577 Advisory for vendor-provided technical context.
Detection Methods for CVE-2024-43577
Indicators of Compromise
- Browser telemetry showing Edge navigation to newly registered or low-reputation domains hosting look-alike login pages
- Endpoint logs indicating credential submissions to domains that visually mimic corporate or SaaS login portals
- Proxy logs recording sessions where Edge users visited pages containing obfuscated JavaScript that manipulates address bar or dialog rendering
Detection Strategies
- Monitor Microsoft Edge version strings across the fleet and flag installations older than the October 2024 security update
- Correlate web proxy logs with threat intelligence feeds to identify phishing infrastructure targeting Edge users
- Deploy browser isolation or extension-based phishing identification for high-risk user groups
Monitoring Recommendations
- Enable SmartScreen and enterprise phishing protection policies in Microsoft Edge for Business
- Ingest browser and endpoint telemetry into a centralized analytics platform to identify anomalous navigation patterns and credential entry events
- Track user reports of suspicious browser UI behavior through the security operations intake process
How to Mitigate CVE-2024-43577
Immediate Actions Required
- Update Microsoft Edge to the version released in Microsoft's October 2024 security update or later
- Verify auto-update is enabled and functional across all managed endpoints running Edge
- Communicate phishing awareness reminders to users, emphasizing verification of URLs and security indicators
Patch Information
Microsoft addressed CVE-2024-43577 in the October 2024 Edge security release. Administrators should consult the Microsoft CVE-2024-43577 Advisory for exact build numbers and deployment guidance. Managed environments should deploy the update through Microsoft Intune, Configuration Manager, or the Edge update service.
Workarounds
- Restrict browsing to trusted sites using enterprise URL allow-lists for high-risk user populations until patching completes
- Enforce Microsoft Defender SmartScreen and enhanced phishing protection through Edge group policy settings
- Require multi-factor authentication (MFA) on all corporate accounts to reduce the impact of credential capture from spoofed pages
# Configuration example: enforce Edge auto-update and SmartScreen via Group Policy on Windows
# Set registry keys to enable automatic updates and phishing protection
reg add "HKLM\SOFTWARE\Policies\Microsoft\EdgeUpdate" /v UpdateDefault /t REG_DWORD /d 1 /f
reg add "HKLM\SOFTWARE\Policies\Microsoft\Edge" /v SmartScreenEnabled /t REG_DWORD /d 1 /f
reg add "HKLM\SOFTWARE\Policies\Microsoft\Edge" /v SmartScreenPuaEnabled /t REG_DWORD /d 1 /f
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
