CVE-2025-0247
CRITICALFirefox and Thunderbird < 134.0 - Out-of-bounds Write
Title source: llmDescription
Memory safety bugs present in Firefox 133 and Thunderbird 133. 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 and Thunderbird 134.
References (3)
Core 3
Core References
Broken Link, Issue Tracking
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1835193%2C1910021%2C1919803%2C1931576%2C1931948%2C1932173
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-01/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-04/
Scores
CVSS v3
9.8
EPSS
0.1506
EPSS Percentile
94.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-787
Status
published
Products (4)
mozilla/firefox
< 134.0
Mozilla/Firefox
134
mozilla/thunderbird
< 134.0
Mozilla/Thunderbird
134
Published
Jan 07, 2025
Tracked Since
Feb 18, 2026