CVE-2020-4067: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only; version 19.10 only; version 20.04 only
• Coturn Project Coturn: before 4.5.1.3 (fixed in 4.5.1.3)
• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 31 only; version 32 only
• Opensuse Leap: version 15.2 only

Published 2020-06-29. Last modified 2026-06-17.