CVE-2025-1012
HIGHCVSS 7.5/10EPSS 0.42%
Last modified
CVE-2025-1012 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.. EPSS estimates a 0.42% chance of exploitation in the next 30 days.
Description
A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 115.20.0 |
| Mozilla | Firefox | < 135.0 |
| Mozilla | Firefox | >= 128.1.0, < 128.7.0 |
| Mozilla | Thunderbird | < 135.0 |
| Mozilla | Thunderbird | >= 128.0.1, < 128.7.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1939710Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-07/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-08/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-09/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-10/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-11/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-1012?
A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
How severe is CVE-2025-1012?
CVE-2025-1012 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.
How do I fix CVE-2025-1012?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2025
- CVE-2025-10113A security vulnerability has been detected in itsourcecode S…9.8
- CVE-2025-10114A vulnerability was found in PHPGurukul Small CRM 4.0. Affec…9.8
- CVE-2025-10115A vulnerability was determined in SiempreCMS up to 1.3.6. Th…7.3
- CVE-2025-10116A vulnerability was identified in SiempreCMS up to 1.3.6. Th…7.3
- CVE-2025-10117A weakness has been identified in SourceCodester Simple To-D…5.4
- CVE-2025-10118A security vulnerability has been detected in itsourcecode E…9.8
- CVE-2025-10120A vulnerability was detected in Tenda AC20 up to 16.03.08.12…8.8
- CVE-2025-10121A flaw has been found in uverif up to 3.2. This affects the …6.3
- CVE-2025-10122A vulnerability was found in Maccms10 2025.1000.4050. Affect…7.2
- CVE-2025-10123A vulnerability was determined in D-Link DIR-823X up to 2504…9.8
- CVE-2025-10124The Booking Manager WordPress plugin before 2.1.15 register…4.5
- CVE-2025-10125The Memberlite Shortcodes plugin for WordPress is vulnerable…6.4
Are you affected by CVE-2025-1012?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST