CVE-2021-33193

Publication date 16 August 2021

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
apache2 22.04 LTS jammy
Fixed 2.4.48-3.1ubuntu2
21.10 impish
Fixed 2.4.48-3.1ubuntu2
21.04 hirsute
Fixed 2.4.46-4ubuntu1.2
20.04 LTS focal
Fixed 2.4.41-4ubuntu3.5
18.04 LTS bionic
Fixed 2.4.29-1ubuntu4.17
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes


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

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
apache2

Severity score breakdown

Parameter Value
Base score 7.5 · High
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

References

Related Ubuntu Security Notices (USN)

    • USN-5090-1
    • Apache HTTP Server vulnerabilities
    • 27 September 2021

Other references