CVE-2017-5195 Irssi CVE debrief

Who should care

Irssi users, system administrators, and distribution/package maintainers should care, especially for environments where IRC clients are exposed to untrusted message content. Security teams managing desktop or terminal-based communication tools should prioritize updating affected Irssi installations.

Technical summary

NVD describes the issue as CWE-125 (out-of-bounds read). A remote attacker can supply a crafted ANSI x8 color code that leads Irssi to read outside the intended memory bounds, resulting in a crash. The vulnerability is network-exploitable, requires no privileges or user interaction, and affects Irssi versions from 0.8.17 up to but not including 0.8.21.

Defensive priority

High for any environment running affected Irssi versions, because exploitation is remote and unauthenticated and can disrupt client availability. The impact is limited to denial of service, but the low attack complexity and lack of user interaction make timely patching appropriate.

Recommended defensive actions

• Upgrade Irssi to 0.8.21 or later.
• Apply vendor or distribution security updates that include the Irssi fix.
• Review the Irssi security advisory for any version-specific remediation guidance.
• If immediate upgrade is not possible, restrict use of affected clients in high-trust workflows and monitor for unexpected crashes while planning remediation.

Evidence notes

This debrief is based on the NVD record for CVE-2017-5195, which lists the affected version range, CVSS vector, and CWE-125 classification. The vendor advisory and related references are provided in the NVD metadata, including the Irssi security notice and contemporaneous mailing-list and distribution advisories.

Official resources