CVE-2020-14303: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 3.5% chance of exploitation in the next 30 days.

A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 18.04 only; version 20.04 only
• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 31 only
• Opensuse Leap: version 15.1 only; version 15.2 only
• Samba Samba: from 4.10.0, before 4.10.17 (fixed in 4.10.17); from 4.11.0, before 4.11.11 (fixed in 4.11.11); from 4.12.0, before 4.12.4 (fixed in 4.12.4)

Published 2020-07-06. Last modified 2026-06-17.