Emergency Update: Tor Browser 13.5.14 Released for Windows 7, 8, and 8.1 Users

Emergency Update for Tor Browser: Critical Security Fix for Legacy Windows Users

The Tor Project has announced an urgent update for Tor Browser version 13.5.14, specifically aimed at users operating on Windows 7, 8, and 8.1. This release is part of the ongoing legacy support for these older systems, providing essential security patches to protect users from potential vulnerabilities.

Windows users are strongly advised to update their browsers immediately to mitigate risks associated with the vulnerabilities addressed in this release. The update incorporates vital security fixes backported from Firefox 128.8.1 ESR, targeting a critical flaw in Firefox’s sandboxing mechanisms. This vulnerability, tracked as CVE-2025-2857, could allow attackers to escape the browser’s sandbox and execute arbitrary code, posing severe risks to user security.

According to the Mozilla Foundation Security Advisory 2025-19, this flaw has been actively exploited, making the update even more pressing. The vulnerability was identified in the Inter-Process Communication (IPC) code of Firefox, which is crucial for safely isolating processes within the browser. If exploited, it could lead to a complete system compromise.

This emergency release is exclusively for users on Windows 7, 8, and 8.1. Those using other operating systems or newer versions of Windows are encouraged to download the latest stable version of Tor Browser, 14.0 or higher, which includes the latest features and security enhancements.

The Tor Browser 13.5.14 update not only addresses critical vulnerabilities but also includes bug fixes and optimizations for a better user experience. As the Tor Project continues to support legacy systems, users are urged to consider upgrading to newer operating systems to ensure ongoing security and access to the latest features.