Vulnerability Database

299,442

Total vulnerabilities in the database

CVE-2021-29991

Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox < 91.0.1 and Thunderbird < 91.0.1.

  • Published: Nov 3, 2021
  • Updated: Apr 14, 2023
  • CVE: CVE-2021-29991
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.1
  • AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS v2:

  • Severity: Medium
  • Score: 5.8
  • AV:N/AC:M/Au:N/C:P/I:P/A:N

CWEs:

Software From Fixed in
mozilla / thunderbird - 91.0.1
mozilla / firefox - 91.0.1