CVE-2021-33193
Published: 16 August 2021
A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
Notes
| Author | Note |
|---|---|
| mdeslaur | commits for trunk and 2.4 don't match, needs investigation commit for 2.4 is the one listed in the vulnerability report as of 2021-08-26, no new version of apache contains the fix |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
apache2 Launchpad, Ubuntu, Debian |
bionic |
Released
(2.4.29-1ubuntu4.17)
|
| focal |
Released
(2.4.41-4ubuntu3.5)
|
|
| hirsute |
Released
(2.4.46-4ubuntu1.2)
|
|
| impish |
Released
(2.4.48-3.1ubuntu2)
|
|
| jammy |
Released
(2.4.48-3.1ubuntu2)
|
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Released
(2.4.48-4)
|
|
| xenial |
Not vulnerable
(http2 disabled in xenial)
|
|
|
Patches: upstream: https://github.com/apache/httpd/commit/f990e5ecad40b100a8a5c7c1033c46044a9cb244 upstream: https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |