CVE-2016-0736: Apache HTTP Server

High severity, CVSS 7.5. EPSS: 49% chance of exploitation in the next 30 days.

In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.

Affected products

• Apache HTTP Server: version 2.4.0 only; version 2.4.1 only; version 2.4.2 only; version 2.4.3 only; version 2.4.6 only; version 2.4.7 only; …

Published 2017-07-27. Last modified 2026-06-17.