Radicale, a simple calendar and addressbook server - daemon, is prone to timing oracles and simple brute-force attacks when using the htpasswd authentication method.

For Debian 8 Jessie, this problem has been fixed in version 0.9-1+deb8u2.

We recommend that you upgrade your radicale packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS