CVE-2025-21408
Published: 06 February 2025
Summary
CVE-2025-21408 is a high-severity Type Confusion (CWE-843) vulnerability in Microsoft Edge Chromium. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked in the top 41.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-2 (Flaw Remediation) and RA-5 (Vulnerability Monitoring and Scanning).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly remediates the specific remote code execution flaw in Microsoft Edge by requiring timely patching as detailed in the MSRC update guide.
Anti-malware scanning and protection mechanisms prevent or detect malicious payloads exploiting this browser RCE vulnerability via user-interacted links.
Vulnerability scanning identifies systems running vulnerable versions of Microsoft Edge, enabling remediation before exploitation of CVE-2025-21408.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Browser RCE vulnerability exploited via malicious link with user interaction directly enables T1203 (Exploitation for Client Execution) and T1204.001 (Malicious Link) for initial code execution on the client system.
NVD Description
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
Deeper analysisAI
CVE-2025-21408 is a Remote Code Execution vulnerability in Microsoft Edge, the Chromium-based web browser. Published on 2025-02-06, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) and is associated with CWE-843 and NVD-CWE-noinfo.
The vulnerability enables exploitation over a network with low attack complexity, requiring no privileges but user interaction, such as clicking a malicious link. Attackers can achieve high impacts on confidentiality, integrity, and availability, allowing remote code execution on affected systems.
Microsoft's Security Response Center update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21408 provides details on patches and mitigation steps.
Details
- CWE(s)