CVE-2025-3031: Vulnerability in Mozilla Firefox
An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. This vulnerability was fixed in Firefox 137 and Thunderbird 137.
AI Analysis
Technical Summary
CVE-2025-3031 is a vulnerability in Mozilla Firefox and Thunderbird related to JIT (Just-In-Time) compilation optimizations where stack slot sizes differ, allowing an attacker to read 32 bits of data spilled onto the stack. This could lead to partial information disclosure. The vulnerability was reported by 'anbu' and is tracked under Bug 1947141. It affects Firefox and Thunderbird versions prior to 137. The issue is addressed in Mozilla security advisories MFSA 2025-20 and MFSA 2025-23, which list this vulnerability among others fixed in Firefox 137 and Thunderbird 137.
Potential Impact
The vulnerability allows an attacker to read 32 bits of stack data in a JIT compiled function, potentially exposing sensitive information. The CVSS 3.1 score of 6.5 reflects a medium severity with impacts on confidentiality and integrity but no impact on availability. There are no reports of active exploitation in the wild. The vulnerability does not allow code execution or privilege escalation by itself but could aid in information leakage.
Mitigation Recommendations
This vulnerability has been fixed in Firefox 137 and Thunderbird 137. Users and administrators should update to these versions or later to remediate the issue. The vendor advisories from Mozilla (MFSA 2025-20 and MFSA 2025-23) confirm the availability of an official fix. No additional mitigation actions are required beyond applying the update.
CVE-2025-3031: Vulnerability in Mozilla Firefox
Description
An attacker could read 32 bits of values spilled onto the stack in a JIT compiled function. This vulnerability was fixed in Firefox 137 and Thunderbird 137.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-3031 is a vulnerability in Mozilla Firefox and Thunderbird related to JIT (Just-In-Time) compilation optimizations where stack slot sizes differ, allowing an attacker to read 32 bits of data spilled onto the stack. This could lead to partial information disclosure. The vulnerability was reported by 'anbu' and is tracked under Bug 1947141. It affects Firefox and Thunderbird versions prior to 137. The issue is addressed in Mozilla security advisories MFSA 2025-20 and MFSA 2025-23, which list this vulnerability among others fixed in Firefox 137 and Thunderbird 137.
Potential Impact
The vulnerability allows an attacker to read 32 bits of stack data in a JIT compiled function, potentially exposing sensitive information. The CVSS 3.1 score of 6.5 reflects a medium severity with impacts on confidentiality and integrity but no impact on availability. There are no reports of active exploitation in the wild. The vulnerability does not allow code execution or privilege escalation by itself but could aid in information leakage.
Mitigation Recommendations
This vulnerability has been fixed in Firefox 137 and Thunderbird 137. Users and administrators should update to these versions or later to remediate the issue. The vendor advisories from Mozilla (MFSA 2025-20 and MFSA 2025-23) confirm the availability of an official fix. No additional mitigation actions are required beyond applying the update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2025-03-31T09:35:24.758Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2025-20/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-23/","vendor":"Mozilla"}]
Threat ID: 69dd057b82d89c981f0174d8
Added to database: 4/13/2026, 3:02:19 PM
Last enriched: 4/13/2026, 3:18:16 PM
Last updated: 4/13/2026, 5:57:59 PM
Views: 5
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