Microsoft has released a critical security update for its Edge browser, addressing multiple vulnerabilities that could allow attackers to execute remote code and compromise user systems.
Users are strongly urged to update their browsers immediately to mitigate potential risks.
Four significant vulnerabilities—CVE-2025-21342, CVE-2025-21408, CVE-2025-21283, and CVE-2025-21279—were identified in the latest Microsoft Edge release (version 133.0.3065.51, based on Chromium 133.0.6943.53/54).
Edge Multiple Remote Code Execution Vulnerabilities
These vulnerabilities share a common exploit scenario: attackers could execute remote code by tricking users into clicking specially crafted malicious links.
CVE-2025-21342
This vulnerability poses a high risk as it allows attackers to compromise confidentiality, integrity, and availability. Specifically, an attacker could:
- View sensitive user information,
- Alter disclosed information,
- Force browser tabs to crash.
The attack vector is network-based, and exploitation requires user interaction. If successfully exploited, the attacker gains control over the renderer process of the browser. However, Microsoft has assessed this vulnerability as “Exploitation Less Likely” at the time of publication.
CVE-2025-21408
Similar to CVE-2025-21342, this vulnerability also requires users to click on a malicious link for exploitation. Attackers can initiate remote code execution within the renderer process of the browser. Despite its potential severity, Microsoft has categorized this vulnerability as “Exploitation Unlikely.”
CVE-2025-21283
This vulnerability shares the same attack vector and exploit conditions as the others. A user clicking on a specially crafted URL could enable an attacker to execute remote code in the renderer process. Like CVE-2025-21342, it is deemed “Exploitation Less Likely.”
CVE-2025-21279
The final vulnerability addressed in this release also involves remote code execution triggered by user interaction with a malicious link. While it poses similar risks as the other vulnerabilities, Microsoft has again assessed it as “Exploitation Less Likely.”
Update Now
The vulnerabilities were patched in Microsoft Edge version 133.0.3065.51, released on February 6, 2025. This version is based on Chromium 133.0.6943.53/54 and includes critical security fixes to safeguard users against these threats.
All four vulnerabilities require user interaction, meaning victims must click on a malicious link for an attack to succeed. The attack vector is network-based, making it possible for attackers to deliver payloads via phishing emails, malicious websites, or other online channels.
Importantly, none of these vulnerabilities have been publicly disclosed or exploited in the wild at the time of publication. However, their potential impact underscores the urgency of updating to the latest version of Microsoft Edge.
How to Update
To ensure your browser is secure:
- Open Microsoft Edge.
- Navigate to Settings > About Microsoft Edge.
- If available, the browser will automatically check for updates and install the latest version.
Given the critical nature of these vulnerabilities, users should prioritize updating their browsers immediately to protect against potential attacks. Organizations should also encourage employees to update their browsers and remain vigilant against phishing attempts that could exploit these flaws.
While Microsoft has assessed exploitation as less likely or unlikely for these vulnerabilities, staying updated is essential for maintaining robust security in an ever-evolving threat landscape.
PCI DSS 4.0 & Supply Chain Attack Prevention – Free Webinar
