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
| Author | Note |
|---|---|
| tyhicks | mozjs contains a copy of the SpiderMonkey JavaScript engine |
Priority
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 |