CVE-2020-1983: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 2.4% chance of exploitation in the next 30 days.

A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows crafted packets to cause a denial of service.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.10 only; version 20.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• Libslirp Project Libslirp: up to and including 4.2.0
• Opensuse Leap: version 15.1 only

Published 2020-04-22. Last modified 2026-06-17.