Multiple vulnerabilities has been discovered and corrected in ISC DHCP: An error in the handling of malformed client identifiers can cause a DHCP server running affected versions to enter a state where further client requests are not processed and the server process loops endlessly, consuming all available CPU cycles. Under normal circumstances this condition should not be triggered, but a non-conforming or malicious client could deliberately trigger it in a vulnerable server. In order to exploit this condition an attacker must be able to send requests to the DHCP server . Two memory leaks have been found and fixed in ISC DHCP. Both are reproducible when running in DHCPv6 mode The first leak is confirmed to only affect servers operating in DHCPv6 mode, but based on initial code analysis the second may theoretically affect DHCPv4 servers . The updated packages have been patched to correct these issues.