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 Critical Flaws in Mozilla Firefox Leading to Arbitrary Code Execution
## CVE Details
* **CVE ID:** Multiple (e.g., CVE-2025-13021, CVE-2025-13022, CVE-2025-13012, CVE-2025-13023, CVE-2025-13016, CVE-2025-13024, CVE-2025-13025, CVE-2025-13026, CVE-2025-13027, CVE-2025-13017, CVE-2025-13019, CVE-2025-13018, CVE-2025-13013, CVE-2025-13020, CVE-2025-13014, CVE-2025-13015)
*Note: CVSS Scores were not provided in the source text, only the severity outcome (Arbitrary Code Execution).*
* **CVSS Score:** N/A (Severity: Critical due to Arbitrary Code Execution risk)
* **CWE:** Multiple (Includes Incorrect Boundary Conditions, Race Condition, JIT Miscompilation, Use-after-free, Policy Bypass)
## Affected Systems
* **Products:** Mozilla Firefox, Mozilla Firefox ESR
* **Versions:**
* Firefox versions prior to **145**
* Firefox ESR versions prior to **115.30**
* Firefox ESR versions prior to **140.5**
* **Configurations:** Any standard installation where the product is running an unpatched version. Exploitation impact is higher for users operating with administrative rights.
## Vulnerability Description
Multiple vulnerabilities exist across various components of Mozilla products, with the most severe flaws residing in the **Graphics** and **JavaScript Engine** components. These include:
* Incorrect boundary conditions in the Graphics component (several CVEs).
* A race condition in the Graphics component.
* Sandbox escapes stemming from incorrect boundary conditions in the Graphics component.
* JIT miscompilation in the JavaScript Engine.
* Memory safety bugs.
* Several lower severity issues including Same-origin policy bypass, mitigation bypass, Use-after-free in WebRTC and Audio/Video, and a Spoofing issue.
The primary threat stems from successful exploitation leading to **Arbitrary Code Execution (ACE)**.
## Exploitation
* **Status:** Not exploited in the wild (as of the advisory date).
* **Complexity:** Implied to be relatively low for the most severe flaws, as the Tactics/Techniques listed suggest **Initial Access** via **Drive-by Compromise** (T1189).
* **Attack Vector:** Network (via web browsing).
## Impact
* **Confidentiality:** High (Successful exploitation allows viewing/changing/deleting data post-exploitation).
* **Integrity:** High (Successful exploitation allows installing programs and creating new user accounts).
* **Availability:** Medium (Impact dependent on post-exploitation payload).
## Remediation
### Patches
Users must update immediately to the following patched versions (or newer):
* **Firefox:** Update to version **145** or later.
* **Firefox ESR:** Update to version **115.30** or later.
* **Firefox ESR:** Update to version **140.5** or later.
### Workarounds
* Apply the Principle of Least Privilege: Run all software, including the web browser, as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
## Detection
* **Indicators of Compromise:** IOCs are not specified in the summary, but post-exploitation activity would involve unexpected program installation, file modification/deletion, or creation of new user accounts.
* **Detection Methods and Tools:** Implement automated application patch management (Safeguard 7.4) and robust vulnerability scanning to identify vulnerable versions.
## References
* **Vendor Advisories (Mozilla):**
* https://www.mozilla.org/en-US/security/advisories/mfsa2025-87/ (defanged)
* https://www.mozilla.org/en-US/security/advisories/mfsa2025-88/ (defanged)
* https://www.mozilla.org/en-US/security/advisories/mfsa2025-89/ (defanged)
* **CVE Lookups (Examples):**
* https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-13025 (defanged)
* **MS-ISAC Advisory:** MS-ISAC ADVISORY NUMBER: 2025-106