CVE-2015-1779: Canonical Ubuntu Linux

High severity, CVSS 8.6. EPSS: 6.6% chance of exploitation in the next 30 days.

The VNC websocket frame decoder in QEMU allows remote attackers to cause a denial of service (memory and CPU consumption) via a large (1) websocket payload or (2) HTTP headers section.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 14.10 only; version 15.04 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• Fedoraproject Fedora: version 21 only; version 22 only
• Oracle Linux: version 7 only
• Qemu Qemu: up to and including 2.2.1; version 2.3.0 only
• Red Hat Enterprise Linux Eus: version 7.1 only; version 7.2 only; version 7.3 only; version 7.4 only; version 7.5 only; version 7.6 only; …
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.3 only; version 7.4 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Server Tus: version 7.3 only; version 7.6 only; version 7.7 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Red Hat Virtualization: version 3.0 only

Published 2016-01-12. Last modified 2026-06-17.