EUVD-2025-18100

Comprehensive Technical Analysis of EUVD-2025-18100

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2025-18100, also known as CVE-2025-49710, is an integer overflow issue in the OrderedHashTable used by the JavaScript engine in Firefox. This vulnerability has a CVSS Base Score of 9.8, which is classified as critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:

• Attack Vector (AV:N): Network, meaning the vulnerability is exploitable remotely.
• Attack Complexity (AC:L): Low, indicating that the attack is relatively straightforward to execute.
• Privileges Required (PR:N): None, meaning no special privileges are needed to exploit the vulnerability.
• User Interaction (UI:N): None, indicating that no user interaction is required for the attack to succeed.
• Scope (S:U): Unchanged, meaning the vulnerability does not affect other systems or components beyond the initial target.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:H): High impact on availability.

Given these metrics, the vulnerability poses a significant risk to systems running affected versions of Firefox.

2. Potential Attack Vectors and Exploitation Methods

The integer overflow in the OrderedHashTable can be exploited through crafted JavaScript code. Potential attack vectors include:

• Malicious Websites: An attacker could host a malicious website that, when visited by a user running a vulnerable version of Firefox, executes the exploit.
• Advertisements: Malicious JavaScript code could be embedded in online advertisements, which are then displayed on legitimate websites.
• Phishing Emails: Emails containing links to malicious websites could be sent to users, enticing them to click and visit the site.

Exploitation methods could involve:

• Heap Spraying: By manipulating the OrderedHashTable, an attacker could spray the heap with controlled data, leading to arbitrary code execution.
• Buffer Overflow: The integer overflow could be used to overwrite adjacent memory, leading to code execution or denial of service.

3. Affected Systems and Software Versions

The vulnerability affects Firefox versions prior to 139.0.4. Users and organizations running these versions are at risk and should prioritize updating to a patched version.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Update Software: Immediately update Firefox to version 139.0.4 or later.
• Disable JavaScript: Temporarily disable JavaScript in the browser settings, especially for untrusted websites.
• Use Security Extensions: Employ browser extensions that block malicious scripts and advertisements.
• Network Security: Implement network-level security measures such as firewalls and intrusion detection systems to monitor and block suspicious traffic.
• User Education: Educate users about the risks of visiting unknown websites and clicking on suspicious links.

5. Impact on European Cybersecurity Landscape

The European cybersecurity landscape is significantly impacted by this vulnerability due to the widespread use of Firefox. Organizations and individuals relying on Firefox for web browsing are at risk of data breaches, unauthorized access, and system compromise. The high severity score and the ease of exploitation make this vulnerability a critical concern for cybersecurity professionals in Europe.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerability Type: Integer overflow in OrderedHashTable.
• Affected Component: JavaScript engine in Firefox.
• Exploit Mechanism: Crafted JavaScript code that triggers the overflow, leading to potential code execution or denial of service.
• Detection: Monitor for unusual JavaScript execution patterns and unexpected browser crashes.
• Patch Analysis: Review the patch provided in Firefox 139.0.4 to understand the specific changes made to mitigate the vulnerability.
• References:
  • Mozilla Bugzilla
  • Mozilla Security Advisory
  • NVD Detail

By understanding these details, security professionals can better assess the risk, implement appropriate mitigations, and ensure the security of their systems and users.