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[USN-7639-1] Apache HTTP Server vulnerabilities

Posted on 16 July 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7639-1
July 16, 2025

apache2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in Apache HTTP Server.

Software Description:
- apache2: Apache HTTP server

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 mod_proxy_http2
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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.04
apache2 2.4.63-1ubuntu1.1

Ubuntu 24.04 LTS
apache2 2.4.58-1ubuntu8.7

Ubuntu 22.04 LTS
apache2 2.4.52-1ubuntu4.15

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7639-1
CVE-2024-42516, CVE-2024-43204, CVE-2024-47252, CVE-2025-23048,
CVE-2025-49630, CVE-2025-49812, CVE-2025-53020

Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.63-1ubuntu1.1
https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.7
https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.15

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