CVE-2017-15721: Debian Linux

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

In Irssi before 1.0.5, certain incorrectly formatted DCC CTCP messages could cause a NULL pointer dereference. This is a separate, but similar, issue relative to CVE-2017-9468.

Affected products

• Debian Debian Linux: version 7.0 only; version 8.0 only; version 9.0 only
• Irssi Irssi: up to and including 1.0.4

Published 2017-10-22. Last modified 2026-06-17.