Packages
- 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...
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
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 20.04 focal | apache2 – 2.4.41-4ubuntu3.23+esm2 | ||
| 18.04 bionic | apache2 – 2.4.29-1ubuntu4.27+esm6 | ||
| 16.04 xenial | apache2 – 2.4.18-2ubuntu3.17+esm16 | ||
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