CVE-2025-3034: Vulnerability in Mozilla Firefox
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.
AI Analysis
Technical Summary
This vulnerability consists of memory safety bugs in Firefox 136 and Thunderbird 136, some of which showed evidence of memory corruption. With sufficient effort, these bugs could have been exploited to run arbitrary code. Mozilla addressed these issues in Firefox 137 and Thunderbird 137. The CVSS 3.1 score is 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H), reflecting a network attack vector with high impact but requiring high attack complexity and no privileges or user interaction. The vendor advisories MFSA 2025-20 and MFSA 2025-23 provide detailed information and confirm the fixes.
Potential Impact
The vulnerability could allow remote attackers to execute arbitrary code due to memory corruption in affected versions of Firefox and Thunderbird. This impacts confidentiality, integrity, and availability of the affected applications. No known active exploitation has been reported. The high CVSS score reflects the potential severity if exploited.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 137 and Thunderbird 137. Users and administrators should update to these versions or later to remediate the issue. Since this is not a cloud service, patching the client software is required. There are no indications that additional mitigation steps are necessary beyond applying the official updates.
CVE-2025-3034: Vulnerability in Mozilla Firefox
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.
CVSS v3.1
Score 8.1high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability consists of memory safety bugs in Firefox 136 and Thunderbird 136, some of which showed evidence of memory corruption. With sufficient effort, these bugs could have been exploited to run arbitrary code. Mozilla addressed these issues in Firefox 137 and Thunderbird 137. The CVSS 3.1 score is 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H), reflecting a network attack vector with high impact but requiring high attack complexity and no privileges or user interaction. The vendor advisories MFSA 2025-20 and MFSA 2025-23 provide detailed information and confirm the fixes.
Potential Impact
The vulnerability could allow remote attackers to execute arbitrary code due to memory corruption in affected versions of Firefox and Thunderbird. This impacts confidentiality, integrity, and availability of the affected applications. No known active exploitation has been reported. The high CVSS score reflects the potential severity if exploited.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 137 and Thunderbird 137. Users and administrators should update to these versions or later to remediate the issue. Since this is not a cloud service, patching the client software is required. There are no indications that additional mitigation steps are necessary beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2025-03-31T09:35:33.843Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 69a0a1c885912abc71d0ba90
Added to database: 2/26/2026, 7:40:56 PM
Last enriched: 4/14/2026, 11:45:04 AM
Last updated: 5/29/2026, 11:19:45 AM
Views: 131
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