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Vulnerability record · CVE-2025-0242 · published 7 January 2025

CVE-2025-0242: Mozilla firefox out-of-bounds write vulnerability

Mozilla · Firefox

Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, Thunderbird 115.18, and Thunderbird 128.5. 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 134, Firefox ESR 128.6, Firefox ESR 115.19, Thunderbird 134, and Thunderbird 128.6.

6.5 CVSS 3.1 Medium EPSS 13% · top 3.8% CWE-787 · Out-of-bounds write
6.5CVSS 3.1 base score
13%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 133, Thunderbird 133, Firefox ESR 115.18, Firefox ESR 128.5, Thunderbird 115.18, and Thunderbird 128.5. 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 134, Firefox ESR 128.6, Firefox ESR 115.19, Thunderbird 134, and Thunderbird 128.6.

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

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=1874523%2C1926454%2C1931873%2C1932169 Broken LinkIssue Tracking
https://www.mozilla.org/security/advisories/mfsa2025-01/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-02/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-03/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-04/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-05/ Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/01/msg00004.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-2025-0242), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.