CVE-2025-11715

Vulnerability

Overview

CVE-2025-11715 is a high-severity vulnerability arising from multiple memory safety bugs in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143, and Thunderbird 143. These bugs showed evidence of memory corruption, and with enough effort an attacker could potentially exploit them to run arbitrary code [1]. The affected products include Firefox, Firefox ESR, and Thunderbird, with the advisory noting that while Thunderbird disables scripting in email reading, the bugs pose risks in browser or browser-like contexts [2][3].

Exploitation

The memory safety bugs are diverse, including use-after-free, out-of-bounds read/write, and cross-process information leakage, as detailed in the related CVEs [1][2][3][4]. Because some bugs can be triggered from a compromised web process to impact a more privileged process, an attacker who successfully achieves a sandbox escape or initial compromise could escalate privileges [1][2]. For instance, a compromised web process could use malicious IPC messages to leak memory from the privileged browser process [1][2].

Impact

Successful exploitation could allow an attacker to execute arbitrary code with the privileges of the affected process, potentially leading to full system compromise depending on the environment [1]. The highest impact scenarios involve attackers gaining control of the browser or email client to read, modify, or exfiltrate sensitive data, or to achieve remote code execution [1][2].

Mitigation

Mozilla fixed these vulnerabilities in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4 [1][2][3][4]. Users are strongly advised to update to these versions immediately. No workarounds are available; applying the patches is the only recommended mitigation.