CVE-2006-6811: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 10.6% chance of exploitation in the next 30 days.

KsIRC 1.3.12 allows remote attackers to cause a denial of service (crash) via a long PRIVMSG string when connecting to an Internet Relay Chat (IRC) server, which causes an assertion failure and results in a NULL pointer dereference. NOTE: this issue was originally reported as a buffer overflow.

Affected products

• Canonical Ubuntu Linux: version 5.10 only; version 6.06 only; version 6.10 only
• Kde Ksirc: version 1.3.12 only

Published 2006-12-29. Last modified 2026-06-16.