CVE-2025-49812

Published: Jul 10, 2025Modified: Jun 17, 2026

7.4

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitability: 2.2 / Impact: 5.2

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Affected (1)

Products: Apache: Http Server

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Apache Http Server	Before 2.4.64

Related CWEs

Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

References (5)

https://httpd.apache.org/security/vulnerabilities_24.html

Source: security@apache.org

Vendor Advisory

http://www.openwall.com/lists/oss-security/2025/07/09/3

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2025/07/10/2

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2025/07/10/9

Source: af854a3a-2127-422b-91ae-364da2661108

https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.