CVE-2020-12409
HIGHCVSS 8.8/10EPSS 1.02%
Last modified
CVE-2020-12409 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. When using certain blank characters in a URL, they where incorrectly rendered as spaces instead of an encoded URL. This vulnerability affects Firefox < 77.. EPSS estimates a 1.02% chance of exploitation in the next 30 days.
Description
When using certain blank characters in a URL, they where incorrectly rendered as spaces instead of an encoded URL. This vulnerability affects Firefox < 77.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 77.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1629506Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-20/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1629506Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-20/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-12409?
When using certain blank characters in a URL, they where incorrectly rendered as spaces instead of an encoded URL. This vulnerability affects Firefox < 77.
How severe is CVE-2020-12409?
CVE-2020-12409 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.
How do I fix CVE-2020-12409?
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.
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Are you affected by CVE-2020-12409?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST