Integer Overflow Vulnerability in Firefox JavaScript Engine
CVE-2025-49710

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
11 June 2025

What is CVE-2025-49710?

An integer overflow vulnerability exists within the OrderedHashTable used by the JavaScript engine in Firefox. This flaw could potentially allow attackers to exploit the overflow condition, which may lead to various adverse consequences, including unauthorized code execution or application crashes, thereby compromising system integrity. The affected versions of Firefox are those prior to 139.0.4, making it crucial for users to update their browsers to mitigate any security risks.

Affected Version(s)

Firefox < 139.0.4

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1970095
https://www.mozilla.org/security/advisories/mfsa2025-47/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Shaheen Fazim
.
CVE-2025-49710 : Integer Overflow Vulnerability in Firefox JavaScript Engine