CVE-2016-1546
Published: 6 July 2016
The Apache HTTP Server 2.4.17 and 2.4.18, when mod_http2 is enabled, does not limit the number of simultaneous stream workers for a single HTTP/2 connection, which allows remote attackers to cause a denial of service (stream-processing outage) via modified flow-control windows.
Notes
| Author | Note |
|---|---|
| sbeattie | http/2 support disabled for xenial, added upsteam in 2.17 fixed upstream in 2.4.20 |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
apache2 Launchpad, Ubuntu, Debian |
precise |
Not vulnerable
(code not present)
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Released
(2.4.20-1)
|
|
| wily |
Not vulnerable
(code not present)
|
|
| xenial |
Not vulnerable
(no mod_http2 support)
|
|
|
Patches: upstream: http://svn.apache.org/viewvc?view=revision&revision=1734413 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |