Introduction
A remote code execution flaw in a browser can let an attacker compromise an endpoint through malicious web content, in enterprise and consumer environments alike. Microsoft Edge, built on the Chromium engine, is widely deployed and regularly targeted by both opportunistic and advanced threat actors. CVE-2025-59251, disclosed on September 24, 2025, is a newly identified remote code execution vulnerability in Microsoft Edge (Chromium-based) with a CVSS score of 7.6.
Technical Information
CVE-2025-59251 is classified as a remote code execution vulnerability in Microsoft Edge (Chromium-based), and the Microsoft Security Update Guide references it. As of this writing, no technical details or root cause explanation has been made public. Public sources contain no code snippets, exploitation methods, or affected code paths.
Earlier remote code execution vulnerabilities in Edge have involved memory corruption, type confusion, or improper access control in the Chromium engine. Nothing confirms that CVE-2025-59251 follows any of these patterns.
Affected Systems and Versions
- Product: Microsoft Edge (Chromium-based)
- Specific affected versions: Not publicly disclosed as of September 24, 2025
- Version ranges: Not specified in available sources
- Vulnerable configurations: Not specified
Vendor Security History
Microsoft Edge has had multiple high-severity vulnerabilities in 2025, several of them remote code execution issues. Microsoft typically releases Edge security updates within days of public disclosure and has a mature vulnerability management process. It regularly incorporates Chromium security fixes and states openly whether a vulnerability is being exploited. Even so, browser vulnerabilities turn up often, which shows how hard complex web-facing applications are to secure.
