UBUNTU-CVE-2021-40438

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Source
https://ubuntu.com/security/CVE-2021-40438
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40438.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-40438
Upstream
Downstream
Related
Published
2021-09-16T15:15:00Z
Modified
2025-09-08T16:47:21Z
Severity
  • 9.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • 9.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.

References

Affected packages

Ubuntu:Pro:16.04:LTS / apache2

Package

Name
apache2
Purl
pkg:deb/ubuntu/apache2@2.4.18-2ubuntu3.17+esm3?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.4.18-2ubuntu3.17+esm3

Affected versions

2.*

2.4.12-2ubuntu2
2.4.17-1ubuntu1
2.4.17-2ubuntu1
2.4.17-3ubuntu1
2.4.18-1ubuntu1
2.4.18-2ubuntu1
2.4.18-2ubuntu2
2.4.18-2ubuntu3
2.4.18-2ubuntu3.1
2.4.18-2ubuntu3.2
2.4.18-2ubuntu3.3
2.4.18-2ubuntu3.4
2.4.18-2ubuntu3.5
2.4.18-2ubuntu3.7
2.4.18-2ubuntu3.8
2.4.18-2ubuntu3.9
2.4.18-2ubuntu3.10
2.4.18-2ubuntu3.12
2.4.18-2ubuntu3.13
2.4.18-2ubuntu3.14
2.4.18-2ubuntu3.15
2.4.18-2ubuntu3.17
2.4.18-2ubuntu3.17+esm1
2.4.18-2ubuntu3.17+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.4.18-2ubuntu3.17+esm3",
            "binary_name": "apache2"
        },
        {
            "binary_version": "2.4.18-2ubuntu3.17+esm3",
            "binary_name": "apache2-bin"
        },
        {
            "binary_version": "2.4.18-2ubuntu3.17+esm3",
            "binary_name": "apache2-data"
        },
        {
            "binary_version": "2.4.18-2ubuntu3.17+esm3",
            "binary_name": "apache2-dev"
        },
        {
            "binary_version": "2.4.18-2ubuntu3.17+esm3",
            "binary_name": "apache2-suexec-custom"
        },
        {
            "binary_version": "2.4.18-2ubuntu3.17+esm3",
            "binary_name": "apache2-suexec-pristine"
        },
        {
            "binary_version": "2.4.18-2ubuntu3.17+esm3",
            "binary_name": "apache2-utils"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:18.04:LTS / apache2

Package

Name
apache2
Purl
pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.18?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.4.29-1ubuntu4.18

Affected versions

2.*

2.4.27-2ubuntu3
2.4.29-1ubuntu1
2.4.29-1ubuntu2
2.4.29-1ubuntu3
2.4.29-1ubuntu4
2.4.29-1ubuntu4.1
2.4.29-1ubuntu4.2
2.4.29-1ubuntu4.3
2.4.29-1ubuntu4.4
2.4.29-1ubuntu4.5
2.4.29-1ubuntu4.6
2.4.29-1ubuntu4.7
2.4.29-1ubuntu4.8
2.4.29-1ubuntu4.10
2.4.29-1ubuntu4.11
2.4.29-1ubuntu4.12
2.4.29-1ubuntu4.13
2.4.29-1ubuntu4.14
2.4.29-1ubuntu4.16
2.4.29-1ubuntu4.17

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2"
        },
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2-bin"
        },
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2-data"
        },
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2-dev"
        },
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2-ssl-dev"
        },
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2-suexec-custom"
        },
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2-suexec-pristine"
        },
        {
            "binary_version": "2.4.29-1ubuntu4.18",
            "binary_name": "apache2-utils"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:20.04:LTS / apache2

Package

Name
apache2
Purl
pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.6?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.4.41-4ubuntu3.6

Affected versions

2.*

2.4.41-1ubuntu1
2.4.41-4ubuntu1
2.4.41-4ubuntu2
2.4.41-4ubuntu3
2.4.41-4ubuntu3.1
2.4.41-4ubuntu3.3
2.4.41-4ubuntu3.4
2.4.41-4ubuntu3.5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2-bin"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2-data"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2-dev"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2-ssl-dev"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2-suexec-custom"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2-suexec-pristine"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "apache2-utils"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "libapache2-mod-md"
        },
        {
            "binary_version": "2.4.41-4ubuntu3.6",
            "binary_name": "libapache2-mod-proxy-uwsgi"
        }
    ],
    "availability": "No subscription required"
}