USN-4994-1

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/notices/USN-4994-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4994-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4994-1
Upstream
Related
Published
2021-06-21T14:01:37.175031Z
Modified
2025-07-16T08:32:57.459651Z
Summary
apache2 vulnerabilities
Details

Marc Stern discovered that the Apache modproxyhttp module incorrectly handled certain requests. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. (CVE-2020-13950)

Antonio Morales discovered that the Apache modauthdigest module incorrectly handled certain Digest nonces. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. (CVE-2020-35452)

Antonio Morales discovered that the Apache mod_session module incorrectly handled certain Cookie headers. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. (CVE-2021-26690)

Christophe Jaillet discovered that the Apache mod_session module incorrectly handled certain SessionHeader values. A remote attacker could use this issue to cause Apache to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-26691)

Christoph Anton Mitterer discovered that the new MergeSlashes configuration option resulted in unexpected behaviour in certain situations. (CVE-2021-30641)

References

Affected packages

Ubuntu:18.04:LTS / apache2

Package

Name
apache2
Purl
pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.16?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.4.29-1ubuntu4.16

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "apache2",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-bin",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-data",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-dbg",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-dev",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-doc",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-ssl-dev",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-suexec-custom",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-suexec-pristine",
            "binary_version": "2.4.29-1ubuntu4.16"
        },
        {
            "binary_name": "apache2-utils",
            "binary_version": "2.4.29-1ubuntu4.16"
        }
    ]
}

Ubuntu:20.04:LTS / apache2

Package

Name
apache2
Purl
pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.3?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.4.41-4ubuntu3.3

Affected versions

2.*

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "apache2",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-bin",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-bin-dbgsym",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-data",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-dev",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-doc",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-ssl-dev",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-suexec-custom",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-suexec-custom-dbgsym",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-suexec-pristine",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-suexec-pristine-dbgsym",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-utils",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "apache2-utils-dbgsym",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "libapache2-mod-md",
            "binary_version": "2.4.41-4ubuntu3.3"
        },
        {
            "binary_name": "libapache2-mod-proxy-uwsgi",
            "binary_version": "2.4.41-4ubuntu3.3"
        }
    ]
}