CVE-2015-1821: Debian Linux

Medium severity, CVSS 6.5. EPSS: 3.4% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 7.0 only
• Tuxfamily Chrony: up to and including 1.31

Published 2015-04-16. Last modified 2026-06-17.