vulnerability
Ubuntu: (Multiple Advisories) (CVE-2025-49812): Apache HTTP Server vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 9 | (AV:N/AC:M/Au:N/C:C/I:C/A:N) | Jul 10, 2025 | Jul 17, 2025 | May 31, 2026 |
Severity
9
CVSS
(AV:N/AC:M/Au:N/C:C/I:C/A:N)
Published
Jul 10, 2025
Added
Jul 17, 2025
Modified
May 31, 2026
Description
In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade.
Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommended to upgrade to version 2.4.64, which removes support for TLS upgrade.
Solutions
ubuntu-pro-upgrade-apache2ubuntu-upgrade-apache2
References
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.