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CVE-2021-29991

Published: 18 August 2021

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.

Notes

AuthorNote
tyhicks
mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Medium

Cvss 3 Severity Score

8.1

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
jammy
Released (91.0.1+build1-0ubuntu1)
lunar
Released (91.0.1+build1-0ubuntu1)
trusty Does not exist

xenial Ignored
(end of standard support, was needed)
upstream
Released (91.0.1)
bionic
Released (91.0.1+build1-0ubuntu0.18.04.1)
focal
Released (91.0.1+build1-0ubuntu0.20.04.1)
hirsute
Released (91.0.1+build1-0ubuntu0.21.04.1)
impish
Released (91.0.1+build1-0ubuntu1)
kinetic
Released (91.0.1+build1-0ubuntu1)
mantic
Released (91.0.1+build1-0ubuntu1)
mozjs38
Launchpad, Ubuntu, Debian
hirsute Does not exist

impish Does not exist

jammy Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

bionic Needs triage

focal Does not exist

kinetic Does not exist

mantic Does not exist

mozjs52
Launchpad, Ubuntu, Debian
bionic Needs triage

hirsute Does not exist

impish Does not exist

jammy Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

focal Needs triage

kinetic Does not exist

mantic Does not exist

mozjs68
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Needs triage

hirsute Does not exist

impish Does not exist

jammy Does not exist

lunar Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

kinetic Does not exist

mantic Does not exist

mozjs78
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

jammy Needs triage

lunar Needs triage

trusty Does not exist

xenial Does not exist

upstream Needs triage

hirsute Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
impish Ignored
(end of life)
mantic Does not exist

thunderbird
Launchpad, Ubuntu, Debian
bionic
Released (1:91.5.0+build1-0ubuntu0.18.04.1)
focal
Released (1:91.5.0+build1-0ubuntu0.20.04.1)
hirsute Ignored
(end of life)
impish Not vulnerable
(1:91.1.2+build1-0ubuntu1)
jammy Not vulnerable
(1:91.1.2+build1-0ubuntu1)
lunar Not vulnerable
(1:91.1.2+build1-0ubuntu1)
xenial Ignored
(end of standard support, was needed)
trusty Does not exist

upstream
Released (91.0.1)
kinetic Not vulnerable
(1:91.1.2+build1-0ubuntu1)
mantic Not vulnerable
(1:91.1.2+build1-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 8.1
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N