vulnerability
Ubuntu: (Multiple Advisories) (CVE-2021-29991): Firefox vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:N/AC:M/Au:N/C:P/I:P/A:N) | Aug 19, 2021 | Aug 20, 2021 | Aug 18, 2025 |
Severity
6
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:N)
Published
Aug 19, 2021
Added
Aug 20, 2021
Modified
Aug 18, 2025
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.
Solutions
ubuntu-upgrade-firefoxubuntu-upgrade-thunderbird
References
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