CVE-2025-11721

CRITICAL EPSS 25.0%
Published Oct 14, 20258mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Oct 14, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

Description

Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144 and Thunderbird 144.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
25.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer Memory Safety

Affected Products 2

VendorProductVersionRange
mozillafirefox*≥143.0  –  <144.0
mozillathunderbird*≥143.0  –  <144.0

References 3

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1986816
    Issue TrackingPermissions Required
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-81/
    Vendor Advisory
  • mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-84/
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.