CVE-2024-7521
HIGHCVSS 8.8/10EPSS 0.58%
Last modified
CVE-2024-7521 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Incomplete WebAssembly exception handing could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.
Description
Incomplete WebAssembly exception handing could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 129.0 |
| Mozilla | Firefox Esr | < 115.14.0 |
| Mozilla | Firefox Esr | 128.0 |
| Mozilla | Thunderbird | < 115.14.0 |
| Mozilla | Thunderbird | 128.0.1 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1904644Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2024-33/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-34/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-35/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-37/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-38/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2024-7521?
Incomplete WebAssembly exception handing could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.
How severe is CVE-2024-7521?
CVE-2024-7521 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2024-7521?
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.
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Are you affected by CVE-2024-7521?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST