CVE-2025-49812 – Apache HTTP Server mod_ssl TLS Desynchronisation Hijack Vulnerability

The following table lists the changes that have been made to the
CVE-2025-49812 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Jul. 10, 2025

    Action Type Old Value New Value
    Added 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.

    Added CWE CWE-287
    Added Reference https://httpd.apache.org/security/vulnerabilities_24.html
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