Full Report
Multiple vulnerabilities have been discovered in Mozilla products, the most severe of which could allow for arbitrary code execution. Mozilla Firefox is a web browser used to access the Internet.Mozilla Firefox ESR is a version of the web browser intended to be deployed in large organizations.Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. Depending on the privileges associated with the user an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.
Analysis Summary
# Vulnerability: Multiple Flaws in Mozilla Firefox Leading to Potential Arbitrary Code Execution
## CVE Details
- CVE ID: CVE-2025-14321, CVE-2025-14322, CVE-2025-14323, CVE-2025-14324, CVE-2025-14325, CVE-2025-14332, CVE-2025-14333 (and others listed below)
- CVSS Score: Not explicitly provided, but the "most severe" vulnerability leads to **Arbitrary Code Execution (ACE)**, suggesting a High or Critical CVSS score.
- CWE: Multiple (e.g., Use-after-free, Boundary Condition Errors, Privilege Escalation).
## Affected Systems
- Products: Mozilla Firefox, Mozilla Firefox ESR (Extended Support Release).
- Versions:
- Firefox versions prior to **146**
- Firefox ESR versions prior to **115.31**
- Firefox ESR versions prior to **140.6**
- Configurations: General web browser usage susceptible to Drive-by Compromise attacks.
## Vulnerability Description
Multiple vulnerabilities exist across various components of Mozilla Firefox and Firefox ESR. The most severe flaws include:
1. **Use-after-free** errors in the WebRTC component (CVE-2025-14321).
2. **Sandbox escape** due to incorrect boundary conditions in the Graphics component (CVE-2025-14322).
3. **Privilege escalation** vulnerability in the DOM (CVE-2025-14323).
4. **JIT miscompilation** issues in the JavaScript Engine (CVE-2025-14324, CVE-2025-14325).
5. Several **memory safety bugs** fixed in the corresponding patched versions.
Successful exploitation of the most severe flaws could lead to **Arbitrary Code Execution (ACE)** on the affected user's system.
## Exploitation
- Status: **Not exploited in the wild** (as of the advisory date).
- Complexity: Implied **Low to Medium** given the technique is 'Drive-by Compromise' (TA0001/T1189), often associated with simple website visits.
- Attack Vector: **Network** (via browsing a malicious webpage).
## Impact
- Confidentiality: High (If ACE is achieved, an attacker can view/change/delete data).
- Integrity: High (If ACE is achieved, an attacker can install programs or create new accounts).
- Availability: High (Potential for system disruption or ransomware deployment following ACE).
*Note: Impact is mitigated if the user account has low privileges.*
## Remediation
### Patches
Users must update to the following fixed versions or newer:
- Firefox versions: **146** and later.
- Firefox ESR versions: **115.31** and later.
- Firefox ESR versions: **140.6** and later.
### Workarounds
No specific workarounds are detailed in the text, but general mitigation recommendations include:
1. Apply the Principle of Least Privilege: Run all software, including the browser, as a non-privileged user.
2. Ensure only fully supported browsers and email clients are used.
## Detection
- Indicators of Compromise (IoC): Not explicitly listed, but successful exploitation would involve unexpected program execution originating from the browser process context.
- Detection methods and tools: Monitor for elevated process activity originating from instances of Firefox/Firefox ESR, especially attempts to modify system files or create new user accounts. Standard vulnerability scanning should detect vulnerable versions.
## References
- CVE IDs Covered (Partial List): CVE-2025-14321 through CVE-2025-14333.
- Vendor Advisories:
- [https://www.mozilla.org/en-US/security/advisories/mfsa2025-92/](https://www.mozilla.org/en-US/security/advisories/mfsa2025-92/)
- [https://www.mozilla.org/en-US/security/advisories/mfsa2025-93/](https://www.mozilla.org/en-US/security/advisories/mfsa2025-93/)
- [https://www.mozilla.org/en-US/security/advisories/mfsa2025-94/](https://www.mozilla.org/en-US/security/advisories/mfsa2025-94/)