Vulnerability Database

314,373

Total vulnerabilities in the database

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.

  • Published: Jul 9, 2020
  • Updated: Nov 16, 2025
  • CVE: CVE-2020-12409
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.8
  • AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v2:

  • Severity: Medium
  • Score: 6.8
  • AV:N/AC:M/Au:N/C:P/I:P/A:P

No CWE or OWASP classifications available.

Software From Fixed in
mozilla / firefox - 77.0