net/krill -- DoS vulnerability

MITRE reports:

	NLnet Labs Krill supports direct access to the RRDP repository
	content through its built-in web server at the "/rrdp" endpoint.
	Prior to 0.12.1 a direct query for any existing directory under
	"/rrdp/", rather than an RRDP file such as "/rrdp/notification.xml"
	as would be expected, causes Krill to crash. If the built-in "/rrdp"
	endpoint is exposed directly to the internet, then malicious remote
	parties can cause the publication server to crash. The repository
	content is not affected by this, but the availability of the server
	and repository can cause issues if this attack is persistent and is
	not mitigated. .