CVE-2021-29991

State: Published
Severity: Not scored
Published: Nov 3, 2021
Updated: Aug 3, 2024
Reserved: Apr 1, 2021

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
FirefoxMozilla	before 91.0.1Affected
ThunderbirdMozilla	before 91.0.1Affected

References

https://www.mozilla.org/security/advisories/mfsa2021-37/
https://bugzilla.mozilla.org/show_bug.cgi?id=1724896

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