Release Notes: The chrony control protocol was modified to prevent amplification attacks (CVE-2014-0021).
Release Notes: Two security vulnerabilities were fixed: a crash when processing crafted commands (CVE-2012-4502) and uninitialized data sent in command replies (CVE-2012-4503).
Release Notes: Combining of measurements from multiple sources was implemented, an option to generate command keys was added, an option to authenticate chronyc automatically was added, compatibility with NTPv1 and NTPv2 clients was improved, and other improvements and bugfixes were made.
Release Notes: Support for stronger authentication via NSS or libtomcrypt has been added, reports printed by chronyc have been extended, and other improvements and bugfixes have been made.
Release Notes: Compatibility with Linux kernel 3.0 was added, replying on multi-homed IPv6 hosts was fixed, and other minor bugfixes and improvements were made.
Release Notes: Clock accuracy with NTP sources and reference clocks was improved. Source selection and polling interval adjustment were improved. Delayed server name resolving was added. Many other bug fixes and improvements were made.
Release Notes: Support for reference clocks (SHM, SOCK, PPS drivers), IPv6 support has been added, Linux capabilities support (to drop root privileges), memory locking support on Linux, real-time scheduler support on Linux, leap second support on Linux, and support for editline have been added. There are many bug fixes and improvements.
Release Notes: Support for IPv6 and initial support for reference clocks were added. On Linux, support for real-time scheduler, memory locking, leap seconds, and Linux capabilities were added. Other bugfixes and improvements were made.
Release Notes: Support for MIPS, x86_64, SPARC, Alpha, ARM, and FreeBSD was added. The sources were made gcc 4 compatible. A problem with certain IP addresses was fixed. There are several other bugfixes and enhancements.