CVE-2025-21342 is a high-severity remote code execution vulnerability affecting Microsoft Edge (Chromium-based). It has a CVSS score of 8.8, which indicates that it poses significant risk to organizations that utilize this web browser. The vulnerability can be exploited over the network with low complexity, requiring user interaction to trigger the attack. Security teams should take action promptly to mitigate potential impacts.
This vulnerability allows attackers to execute arbitrary code on the affected system, leading to severe consequences such as data compromise, system integrity loss, and service unavailability. Organizations using the affected versions of Microsoft Edge must prioritize patching to reduce their exposure to this security risk.
The vulnerability was published on February 6, 2025, and organizations are urged to assess their deployment of Microsoft Edge to determine if they are using a vulnerable version. Given the critical nature of this vulnerability, organizations should address it in their priority patch cycle.
As of the latest updates, there are no known public exploits or proofs of concept available for this vulnerability. However, the potential for exploitation remains high, warranting immediate action from security teams.
Vulnerability Details
The official description of CVE-2025-21342 characterizes it as a remote code execution vulnerability in Microsoft Edge (Chromium-based). The vulnerability type falls under CWE-843, indicating improper validation of the length of user-supplied input, which could lead to memory corruption.
The CVSS score for this vulnerability is 8.8, classified as high severity. The attack vector is network-based, with low attack complexity. It requires no privileges and user interaction is necessary. The impacts on confidentiality, integrity, and availability are all rated as high.
Organizations using Microsoft Edge (Chromium-based) should be aware of the affected versions, which include all versions prior to 133.0.3065.51. The vulnerability was disclosed on February 6, 2025.
Technical Analysis
The root cause of CVE-2025-21342 lies in the improper handling of user input, which can lead to remote code execution. Attackers may exploit this vulnerability by crafting malicious web content that, when interacted with by the user, executes arbitrary code on the victim's machine. The attack vector is network-based, with low complexity and no privileges required.
User interaction is required to exploit this vulnerability, as the malicious code typically needs to be executed in the context of the user's session. The potential impacts on confidentiality, integrity, and availability are significant, as attackers could gain unauthorized access to sensitive data, modify system functionality, or disrupt service availability.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive information, loss of data integrity, and service disruption. Given the nature of the vulnerability, the blast radius could extend to all users of the affected versions of Microsoft Edge, making it crucial for organizations to patch immediately.
The urgency of addressing this vulnerability is heightened by its high CVSS score. Organizations should assess their risk exposure based on their deployment of Microsoft Edge and prioritize remediation efforts accordingly.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Microsoft Edge (Chromium-based) prior to version 133.0.3065.51 are affected by this vulnerability. Organizations should review their current deployments and ensure that they are running the latest version of the browser.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest security patches provided by Microsoft for Microsoft Edge. Upgrading to version 133.0.3065.51 or later will address this vulnerability. If immediate patching is not possible, organizations should implement configuration hardening, such as limiting user permissions and disabling unnecessary features.
Organizations should also consider implementing network controls to monitor for unusual activity related to the browser and ensure that users are trained to recognize potential phishing attempts that could exploit this vulnerability.
For further information on penetration testing services, organizations can refer to the following: penetration testing services that provide a comprehensive evaluation of their security posture.
Detection Guidance
Organizations should monitor logs for unusual browser activity, particularly any unexpected execution of code that may indicate exploitation attempts. Behavioral anomalies, such as processes starting without user consent or elevated permissions, should also be flagged for further investigation.
Network signatures indicating unusual outbound traffic from the browser could also be a sign of exploitation. Security teams should establish monitoring practices to detect such anomalies and respond promptly.
AppSecure Threat Intelligence Insight
CVE-2025-21342 highlights the ongoing risk posed by remote code execution vulnerabilities in widely used software. This incident underscores the necessity for organizations to maintain a proactive security posture, including regular updates and vulnerability assessments.
The trend of remote code execution vulnerabilities indicates a need for robust security practices, including thorough code reviews and user training. Organizations should prioritize their security frameworks to address such vulnerabilities effectively.
For further insights, organizations may refer to the following resources: penetration testing methodology, vulnerability management program design, and API penetration testing guide to enhance security strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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