A flaw was discovered in PolarSSL, a lightweight crypto and SSL/TLS library, which can be exploited by a remote unauthenticated attacker to mount a denial of service against PolarSSL servers that offer GCM ciphersuites. Potentially clients are affected too if a malicious server decides to execute the denial of service attack against its clients (CVE-2014-4911).
The pdns package has been rebuilt against the updated polarssl library.