CVE-2014-6053: Canonical Ubuntu Linux

Medium severity, CVSS 5.0. EPSS: 7.3% chance of exploitation in the next 30 days.

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only
• Debian Debian Linux: version 7.0 only
• Libvncserver Libvncserver: up to and including 0.9.9

Published 2014-12-15. Last modified 2026-06-17.