Vulnerabilities
Vulnerable Software

Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 56.1%
CVSS Severity
CVSS v3 Score 8.1
CVSS v2 Score 5.8
Products affected by CVE-2021-29991


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