Vulnerability in Mozilla Firefox
CVE-2025-0241
When segmenting specially crafted text, segmentation would corrupt memory leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
EPSS: 0.007 (50.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L.
Affected products
- Mozilla Firefox — versions 128.6, 134
- Mozilla Thunderbird — versions 128.6, 134
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Permissions Required, Issue Tracking)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-0241?
- CVE-2025-0241 is a high-severity vulnerability in Mozilla Firefox, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.7/10. Published 2025-01-07.
- How severe is CVE-2025-0241?
- High severity. CVSS v3 base score is 7.7 out of 10.
- Is CVE-2025-0241 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.