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Ubuntu Security Notice USN-7639-2
August 19, 2025
apache2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in Apache HTTP Server.
Software Description:
- apache2: Apache HTTP server
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 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 20.04 LTS
apache2 2.4.41-4ubuntu3.23+esm2
Available with Ubuntu Pro
Ubuntu 18.04 LTS
apache2 2.4.29-1ubuntu4.27+esm6
Available with Ubuntu Pro
Ubuntu 16.04 LTS
apache2 2.4.18-2ubuntu3.17+esm16
Available with Ubuntu Pro
In general, a standard system update will make all the necessary
changes.
References:
https://ubuntu.com/security/notices/USN-7639-2
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,
https://launchpad.net/bugs/2119395
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