CVE-2021-29991

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.

References

https://www.mozilla.org/security/advisories/mfsa2021-37/

https://bugzilla.mozilla.org/show_bug.cgi?id=1724896

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3