Out-of-Bounds Read/Write Vulnerability in Firefox by Mozilla

CVE-2025-4921

What is CVE-2025-4921?

CVE-2025-4921 is an out-of-bounds read/write vulnerability identified in Mozilla Firefox, a widely used web browser developed by Mozilla. This vulnerability arises from improper handling of memory operations, which may lead to unanticipated behavior in the software. Such flaws can enable attackers to read or write memory outside of the allocated bounds, potentially leading to information leakage, application crashes, or further exploitation. Given Firefox's extensive use in both personal and organizational environments, institutions relying on this browser could face serious risks if the vulnerability remains unaddressed.

Potential impact of CVE-2025-4921

1. Information Disclosure: The out-of-bounds nature of this vulnerability could allow malicious actors to access sensitive data stored in the browser memory. This could include user credentials, cookies, or other private information, significantly compromising user privacy and security.

2. Application Stability: Exploitation of this vulnerability may result in crashes or unexpected behavior of the Firefox browser. Such instability can disrupt user productivity and can lead to loss of data or unsaved work in progress, particularly in critical business applications.

3. Chain Exploitation: While this specific vulnerability may not be actively exploited in the wild, the nature of out-of-bounds vulnerabilities allows them to be part of a larger attack vector. Attackers could potentially combine this flaw with other vulnerabilities to escalate privileges or gain unauthorized access to systems, increasing the threat landscape for organizations.

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