{"id":"UBUNTU-CVE-2015-1821","details":"Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to cause a denial of service (chronyd crash) or possibly execute arbitrary code by configuring the (1) NTP or (2) cmdmon access with a subnet size that is indivisible by four and an address with a nonzero bit in the subnet remainder.","modified":"2025-09-08T16:43:20Z","published":"2015-04-16T14:59:00Z","upstream":["CVE-2015-1821"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2015-1821"},{"type":"REPORT","url":"http://git.tuxfamily.org/chrony/chrony.git/commit/?h=1.31-security&id=cf19042ecb656b8afec0cc4906e7dd3ea9266ac8"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2015-1821"},{"type":"REPORT","url":"http://chrony.tuxfamily.org/News.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2015-1821"}],"affected":[{"package":{"name":"chrony","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/chrony@1.29-1ubuntu0.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.29-1ubuntu0.1"}]}],"versions":["1.26-4","1.29-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.29-1ubuntu0.1","binary_name":"chrony"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2015/UBUNTU-CVE-2015-1821.json"}}],"schema_version":"1.7.3","severity":[{"type":"Ubuntu","score":"medium"}]}