An issue was discovered in Irssi before 1.0.7 and 1.1.x before 1.1.1. There is a use-after-free when SASL messages are received in an unexpected order.
https://www.debian.org/security/2018/dsa-4162
https://usn.ubuntu.com/3590-1/
https://irssi.org/security/irssi_sa_2018_02.txt
http://openwall.com/lists/oss-security/2018/02/15/1
Source: Mitre, NVD
Published: 2018-02-15
Updated: 2019-02-28
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical