CVE-2020-12390
CRITICALCVSS 9.8/10EPSS 1.58%
Last modified
CVE-2020-12390 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks. This vulnerability affects Firefox < 76.. EPSS estimates a 1.58% chance of exploitation in the next 30 days.
Description
Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks. This vulnerability affects Firefox < 76.
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 | < 76.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1141959Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1141959Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-12390?
Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks. This vulnerability affects Firefox < 76.
How severe is CVE-2020-12390?
CVE-2020-12390 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.58% probability of exploitation in the next 30 days.
How do I fix CVE-2020-12390?
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.
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Are you affected by CVE-2020-12390?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST