CVE-2025-2857 is a critical vulnerability affecting Mozilla Firefox, with a CVSS score of 10. This vulnerability allows a compromised child process to cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The vulnerability is particularly concerning given its potential for exploitation in the wild.
The issue has been identified following a similar Chrome vulnerability, CVE-2025-2783. It is crucial to note that this vulnerability only affects Firefox on Windows; other operating systems are unaffected. Users are urged to patch their systems promptly.
Given the critical nature of this vulnerability and the active exploitation in the wild, organizations should prioritize patching immediately. The urgency is underscored by the fact that it could lead to significant security breaches if left unaddressed.
Mozilla has released patches in Firefox versions 136.0.4 and ESR versions 128.8.1 and 115.21.1. Organizations should ensure they are updated to these versions to mitigate the risk.
As the situation develops, monitoring for any further updates from Mozilla will be essential to maintain security.
Vulnerability Details
CVE-2025-2857 is classified as a critical vulnerability due to its CVSS score of 10. The vulnerability allows for privilege escalation through a sandbox escape, affecting Mozilla Firefox versions below 136.0.4, Firefox ESR below 128.8.1, and Firefox ESR below 115.21.1.
The vulnerability was disclosed on March 27, 2025. The underlying issue has been classified under CWE-668, which pertains to a flaw that allows a process to return higher privileges than intended.
Technical Analysis
The root cause of this vulnerability lies in the Inter-Process Communication (IPC) code of Firefox. A compromised child process can manipulate the parent process into returning a powerful handle, effectively allowing attackers to escape the intended security sandbox.
The attack vector is classified as NETWORK, with low attack complexity and no privileges or user interaction required. This vulnerability has high impacts on confidentiality, integrity, and availability.
Risk & Impact Analysis
Risk to organizations includes significant exposure to unauthorized access and potential data breaches. An attacker exploiting this vulnerability could gain elevated privileges, leading to a compromise of sensitive data and system integrity.
Given the critical nature and potential exploitability of this vulnerability, organizations should address it in their priority patch cycle. The blast radius is considerable, given that it affects all users of Firefox on Windows.
Organizations are advised to actively monitor for updates regarding this vulnerability and implement the necessary patches to prevent exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of Firefox prior to 136.0.4, Firefox ESR prior to 128.8.1, and Firefox ESR prior to 115.21.1.
Mitigation & Remediation
Organizations should update to the latest versions of Firefox to mitigate this vulnerability: Firefox 136.0.4 and Firefox ESR 128.8.1 or higher.
If immediate patching is not possible, organizations should implement additional network controls and monitoring to mitigate the risks associated with this vulnerability.
For further security practices, organizations can refer to the resources available on application security assessments to enhance their security posture.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor for unusual parent-child process activity, especially with Firefox instances. Look for unexpected modifications in memory allocation patterns or abnormal IPC communications.
Behavioral anomalies such as unexpected process terminations or privilege escalations should also be logged and analyzed.
AppSecure Threat Intelligence Insight
CVE-2025-2857 underscores the importance of rigorous security testing for software applications, especially those relying heavily on IPC mechanisms. Organizations must prioritize regular updates and vulnerability management as part of their security strategy.
For insights into effective security practices, organizations can explore resources such as the penetration testing methodology and the importance of a comprehensive vulnerability management program to address vulnerabilities effectively.
Moreover, organizations should adopt a proactive stance by engaging in cloud penetration testing to identify and mitigate potential weaknesses before they can be exploited.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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