USN-7639-2
- Source
- https://ubuntu.com/security/notices/USN-7639-2
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7639-2.json
- JSON Data
- https://api.osv.dev/v1/vulns/USN-7639-2
- Upstream
- Related
- Published
- 2025-08-19T10:40:27.762420Z
- Modified
- 2025-08-20T09:00:41.995776Z
- Summary
- apache2 vulnerabilities
- Details
-
USN-7639-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and addressed a regression fix (LP: #2119395). CVE-2025-49630 and CVE-2025-53020 only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
Original advisory details:
It was discovered that the Apache HTTP Server incorrectly handled certain Content-Type response headers. A remote attacker could possibly use this issue to perform HTTP response splitting attacks. (CVE-2024-42516)
xiaojunjie discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain requests. A remote attacker could possibly use this issue to send outbound proxy requests to an arbitrary URL. (CVE-2024-43204)
John Runyon discovered that the Apache HTTP Server mod_ssl module incorrectly escaped certain data. A remote attacker could possibly use this issue to insert escape characters into log files. (CVE-2024-47252)
Sven Hebrok, Felix Cramer, Tim Storm, Maximilian Radoy, and Juraj Somorovsky discovered that the Apache HTTP Server mod_ssl module incorrectly handled TLS 1.3 session resumption. A remote attacker could possibly use this issue to bypass access control. (CVE-2025-23048)
Anthony CORSIEZ discovered that the Apache HTTP Server modproxyhttp2 module incorrectly handled missing host headers. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2025-49630)
Robert Merget discovered that the Apache HTTP Server mod_ssl module incorrectly handled TLS upgrades. A remote attacker could possibly use this issue to hijack an HTTP session. This update removes the old "SSLEngine optional" configuration option, possibly requiring a configuration change in certain environments. (CVE-2025-49812)
Gal Bar Nahum discovered that the Apache HTTP Server incorrectly handled certain memory operations. A remote attacker could possibly use this issue to cause the server to consume resources, leading to a denial of service. (CVE-2025-53020)
- References
-
- https://ubuntu.com/security/notices/USN-7639-2
- https://ubuntu.com/security/CVE-2024-42516
- https://ubuntu.com/security/CVE-2024-43204
- https://ubuntu.com/security/CVE-2024-47252
- https://ubuntu.com/security/CVE-2025-23048
- https://ubuntu.com/security/CVE-2025-49630
- https://ubuntu.com/security/CVE-2025-49812
- https://ubuntu.com/security/CVE-2025-53020
- https://launchpad.net/bugs/2119395
Affected packages
Ubuntu:Pro:16.04:LTS / apache2
Package
- Name
- apache2
- Purl
- pkg:deb/ubuntu/apache2@2.4.18-2ubuntu3.17+esm16?arch=source&distro=esm-infra/xenial
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed2.4.18-2ubuntu3.17+esm16
Affected versions
2.*
Ecosystem specific
{
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-bin"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-bin-dbgsym"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-data"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-dbg"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-dbgsym"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-dev"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-dev-dbgsym"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-doc"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-suexec-custom"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-suexec-custom-dbgsym"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-suexec-pristine"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-suexec-pristine-dbgsym"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-utils"
},
{
"binary_version": "2.4.18-2ubuntu3.17+esm16",
"binary_name": "apache2-utils-dbgsym"
}
]
}
Ubuntu:Pro:18.04:LTS / apache2
Package
- Name
- apache2
- Purl
- pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.27+esm6?arch=source&distro=esm-infra/bionic
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed2.4.29-1ubuntu4.27+esm6
Affected versions
2.*
Ecosystem specific
{
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-bin"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-data"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-dbg"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-dev"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-doc"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-ssl-dev"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-suexec-custom"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-suexec-pristine"
},
{
"binary_version": "2.4.29-1ubuntu4.27+esm6",
"binary_name": "apache2-utils"
}
]
}
Ubuntu:Pro:20.04:LTS / apache2
Package
- Name
- apache2
- Purl
- pkg:deb/ubuntu/apache2@2.4.41-4ubuntu3.23+esm2?arch=source&distro=esm-infra/focal
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed2.4.41-4ubuntu3.23+esm2
Affected versions
2.*
Ecosystem specific
{
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-bin"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-bin-dbgsym"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-data"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-dev"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-doc"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-ssl-dev"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-suexec-custom"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-suexec-custom-dbgsym"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-suexec-pristine"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-suexec-pristine-dbgsym"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-utils"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "apache2-utils-dbgsym"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "libapache2-mod-md"
},
{
"binary_version": "2.4.41-4ubuntu3.23+esm2",
"binary_name": "libapache2-mod-proxy-uwsgi"
}
]
}