TYPO3 Core

The class TYPO3\CMS\Core\Http\Request will log any "unsupported" HTTP method as an Exception to the logs. \InvalidArgumentException('Unsupported HTTP method "' . $method . '".', 1436717275);

Knowing this one can exploit any modern TYPO3 setup by simply doing curl -XUNKWNONMETHOD https://target-host in a "slow" loop (slow enough to not be considered a DoS) and spam everyones sys_log.

The correct way of handling an unsupported method is by answering with 501 (Not Implemented).

Discovered in v10, but still valid in current master.