Irssi before 0.8.21 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via a string containing a formatting sequence (%[) without a closing bracket (]).
http://www.openwall.com/lists/oss-security/2017/01/12/8
http://www.openwall.com/lists/oss-security/2017/01/13/2
http://www.securityfocus.com/bid/96581
https://blog.fuzzing-project.org/55-Fuzzing-Irssi-with-Perl-Scripts.html
https://irssi.org/security/irssi_sa_2017_01.txt
https://lists.debian.org/debian-lts-announce/2017/12/msg00022.html
Source: MITRE
Published: 2017-03-03
Updated: 2019-03-15
Type: CWE-125
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH