What is CVE-2025-49710?

CVE-2025-49710 is a critical-severity vulnerability in Mozilla Firefox, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2025-06-11.

How severe is CVE-2025-49710?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Integer overflow in Mozilla Firefox

CVE-2025-49710

An integer overflow was present in `OrderedHashTable` used by the JavaScript engine. This vulnerability was fixed in Firefox 139.0.4.

Vulnerability class: Integer Overflow

EPSS: 0.007 (46.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mozilla Firefox — versions 139.0.4

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

security@mozilla.org (Permissions Required)
security@mozilla.org (Vendor Advisory)

Frequently asked questions

What is CVE-2025-49710?: CVE-2025-49710 is a critical-severity vulnerability in Mozilla Firefox, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2025-06-11.
How severe is CVE-2025-49710?: Critical severity. CVSS v3 base score is 9.8 out of 10.