CyberRota Analysis
This is a high severity vulnerability with a CVSS score of 8.1. It affects Firefox.
CVE
CVE-2021-29991
Severity
HIGH
CVSS
8.1
EPSS
0.89%
Firefox
Original NVD Description
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.
Related CVEs
Other vulnerabilities affecting the same vendor(s)