CVE-2025-11721
Last modified
CVE-2025-11721 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
Description
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144 and Thunderbird 144.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | >= 143.0, < 144.0 |
| Mozilla | Thunderbird | >= 143.0, < 144.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1986816Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-81/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-84/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-11721?
How severe is CVE-2025-11721?
How do I fix CVE-2025-11721?
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-2025-11716Links in a sandboxed iframe could open an external app on An…6.5
- CVE-2025-11717When switching between Android apps using the card carousel …9.1
- CVE-2025-11718When the address bar was hidden due to scrolling on Android,…6.5
- CVE-2025-11719Starting in Thunderbird 143, the use of the native messaging…9.8
- CVE-2025-1172A vulnerability, which was classified as critical, has been …8.8
- CVE-2025-11720The Firefox and Firefox Focus UI for the Android custom tab …8.1
- CVE-2025-11722The Woocommerce Category and Products Accordion Panel plugin…7.5
- CVE-2025-11723The Appointment Booking Calendar — Simply Schedule Appointme…6.5
- CVE-2025-11724The EM Beer Manager plugin for WordPress is vulnerable to ar…8.8
- CVE-2025-11725The Aruba HiSpeed Cache plugin for WordPress is vulnerable t…6.5
- CVE-2025-11726The Beaver Builder – WordPress Page Builder plugin for WordP…4.3
- CVE-2025-11727The Omnichannel for WooCommerce: Google, Amazon, eBay & Walm…7.2
Are you affected by CVE-2025-11721?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST