CVE-2025-49812

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CVSS 3.1

7.4 high

EPSS

<1%p45

Published

Jul 10, 2025 (Jul 10, 2025)

Modified

Jun 17, 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.

Vendors: apache
Products: http server
Weakness: CWE-287
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (0.6%)

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