CVE-2025-59251 in Edge
Summary
by MITRE • 09/24/2025
Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 11/20/2025
This vulnerability represents a critical remote code execution flaw in Microsoft Edge browser that operates on the Chromium engine architecture. The issue stems from improper handling of specific memory operations within the browser's rendering engine, particularly affecting how the browser processes certain web content types. Attackers can exploit this weakness by crafting malicious web pages that trigger memory corruption during normal browsing operations, potentially allowing arbitrary code execution on affected systems. The vulnerability specifically impacts the browser's handling of certain JavaScript objects and memory allocation patterns, creating conditions where attacker-controlled data can overwrite critical memory regions.
The technical exploitation of CVE-2025-59251 leverages memory safety issues within the browser's JavaScript engine implementation. This flaw manifests when the browser processes specially crafted web content that causes heap memory corruption, enabling attackers to manipulate program execution flow through return-oriented programming or other code reuse techniques. The vulnerability operates at the intersection of browser security boundaries, where legitimate web content can be manipulated to trigger memory corruption in the underlying Chromium components. This type of vulnerability typically falls under CWE-119 which describes improper access to memory, and may also relate to CWE-787 which covers out-of-bounds write operations. The exploitation process requires precise control over memory layout and often involves bypassing modern exploit mitigations like address space layout randomization and data execution prevention mechanisms.
The operational impact of this vulnerability extends beyond simple browser compromise, as successful exploitation can lead to complete system compromise and persistent access for attackers. Once executed, the malicious code can establish persistence mechanisms, escalate privileges, and potentially exfiltrate sensitive data from the compromised system. The vulnerability affects all versions of Microsoft Edge that are based on Chromium engine, making it particularly dangerous given the browser's widespread adoption across enterprise and consumer environments. Organizations using Microsoft Edge for daily operations face significant risk exposure, as the vulnerability can be exploited through standard web browsing activities without requiring user interaction beyond visiting malicious websites. This represents a high-severity threat that aligns with ATT&CK technique T1059 for command and scripting interpreter and T1068 for exploit for privilege escalation.
Mitigation strategies for CVE-2025-59251 should prioritize immediate patch deployment from Microsoft, as the vulnerability requires no user interaction for exploitation. Organizations should implement network-based protections such as web application firewalls and content filtering to block access to known malicious domains. Browser hardening measures including disabling unnecessary JavaScript features and implementing strict content security policies can reduce exploitation success rates. Security teams should monitor for indicators of compromise related to this vulnerability, including unusual network connections and process execution patterns. Additional defensive measures include deploying exploit protection software and ensuring regular security updates are applied across all systems. The vulnerability highlights the importance of maintaining up-to-date browser security patches and implementing layered security approaches to protect against zero-day exploits targeting browser components.