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Vulnerability record · CVE-2025-11715 · published 14 October 2025

CVE-2025-11715: Mozilla firefox memory buffer overflow vulnerability

Mozilla · Firefox

Memory safety bugs present in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

8.8 CVSS 3.1 High EPSS 0.33% · top 76.7% CWE-119 · Memory buffer overflow
8.8CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

Memory safety bugs present in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thunderbird 143. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1983838%2C1987624%2C1988244%2C1988912%2C1989734%2C1990085%2C1991899 Broken LinkIssue Tracking
https://www.mozilla.org/security/advisories/mfsa2025-81/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-83/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-84/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-85/ Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html
https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-11715), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.