CVE-2025-29806 Overview
CVE-2025-29806 is a remote code execution vulnerability in Microsoft Edge (Chromium-based). An unauthorized attacker can execute code over a network when a targeted user interacts with malicious content. Microsoft assigned this issue [CWE-843] (Access of Resource Using Incompatible Type - Type Confusion) and [CWE-94] (Improper Control of Generation of Code - Code Injection).
The vulnerability requires user interaction, which typically means the victim must visit an attacker-controlled webpage or open crafted content in the browser. Successful exploitation leads to code execution in the context of the browser process, impacting confidentiality of user data.
Critical Impact
Successful exploitation allows attackers to execute arbitrary code within the Microsoft Edge browser, potentially exposing sensitive user data and browser session information.
Affected Products
- Microsoft Edge (Chromium-based) — all versions prior to the patched release
Discovery Timeline
- 2025-03-23 - CVE-2025-29806 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-29806
Vulnerability Analysis
CVE-2025-29806 combines two weakness classes documented by Microsoft: type confusion [CWE-843] and code injection [CWE-94]. Type confusion occurs when code accesses a resource using an incompatible type, which can be leveraged to interpret memory in unintended ways. When combined with a code injection primitive, an attacker can direct execution flow into attacker-supplied content.
The vulnerability is exploitable over a network path and requires user interaction. This aligns with a typical browser attack pattern, where a victim visits a malicious page or opens crafted web content. Exploitation impacts confidentiality, but does not directly modify integrity or availability of the target system.
Root Cause
Microsoft's advisory categorizes the flaw as a code execution issue arising from a type handling weakness in the Chromium-based Edge browser. Type confusion vulnerabilities in browser engines commonly stem from JavaScript engine optimizations that assume object shape or property types without adequate runtime validation.
Attack Vector
The attack vector is network-based and requires the victim to load attacker-controlled web content in Microsoft Edge. Common delivery paths include phishing links, malicious advertisements, and compromised legitimate sites hosting exploit payloads. No privileges are required on the target system prior to exploitation.
Technical exploitation details have not been published. Refer to the Microsoft Security Update CVE-2025-29806 advisory for vendor-provided information.
Detection Methods for CVE-2025-29806
Indicators of Compromise
- Unexpected child processes spawned by msedge.exe, particularly command interpreters such as cmd.exe or powershell.exe.
- Outbound network connections from Edge renderer processes to newly registered or low-reputation domains.
- Browser crashes or renderer process terminations coinciding with visits to untrusted sites.
Detection Strategies
- Monitor endpoint telemetry for anomalous process lineage originating from Microsoft Edge components.
- Inspect proxy and DNS logs for user navigation to domains associated with exploit kits or malvertising campaigns.
- Correlate browser exploit indicators with subsequent file writes to user-writable directories such as %APPDATA% and %TEMP%.
Monitoring Recommendations
- Track Microsoft Edge version distribution across managed endpoints to confirm patch coverage.
- Alert on execution of scripting engines or LOLBins launched as children of the browser process.
- Ingest browser and endpoint logs into a centralized platform for correlation and retrospective hunting.
How to Mitigate CVE-2025-29806
Immediate Actions Required
- Update Microsoft Edge (Chromium-based) to the latest available version through Microsoft Update or the Edge auto-update mechanism.
- Verify enterprise deployments enforce automatic browser updates and audit endpoints running outdated builds.
- Restrict browsing to trusted sites for high-value users until patch deployment is confirmed across the environment.
Patch Information
Microsoft has released a security update addressing CVE-2025-29806. Full patch details and download links are available in the Microsoft Security Update CVE-2025-29806 advisory. Administrators should confirm the deployed Edge version matches or exceeds the fixed build listed by Microsoft.
Workarounds
- Enforce enterprise browser policies that block untrusted script execution and restrict access to unclassified sites.
- Deploy web content filtering and DNS filtering to reduce exposure to malicious pages hosting exploit content.
- Educate users about phishing lures and malicious advertising that can trigger user-interaction-based browser exploits.
# Verify Microsoft Edge version on Windows endpoints
(Get-Item "$env:ProgramFiles (x86)\Microsoft\Edge\Application\msedge.exe").VersionInfo.ProductVersion
# Force Edge policy refresh after applying updates via Group Policy
gpupdate /force
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
