vulnerability
MFSA2025-20 Firefox: Security Vulnerabilities fixed in Firefox 137 (CVE-2025-3034)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 9 | (AV:N/AC:M/Au:N/C:C/I:C/A:C) | Apr 1, 2025 | Apr 2, 2025 | Apr 15, 2026 |
Severity
9
CVSS
(AV:N/AC:M/Au:N/C:C/I:C/A:C)
Published
Apr 1, 2025
Added
Apr 2, 2025
Modified
Apr 15, 2026
Description
Memory safety bugs present in Firefox 136 and Thunderbird 136. 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 137 and Thunderbird 137.
Solution
mozilla-firefox-upgrade-137_0
Rapid7 Labs
2026 Global Threat Landscape Report
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