CVE-2009-1959

Name	CVE-2009-1959
Description	Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs	531357, 532607

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
irssi (PTS)	buster	1.2.0-2+deb10u1	fixed
	bullseye	1.2.3-1	fixed
	bookworm, sid	1.4.3-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Debian Bugs
irssi	source	etch	0.8.10-3
irssi	source	lenny	0.8.12-7
irssi	source	(unstable)	0.8.13-2	low	531357, 532607

exploitability limited, DoS rather obscure attack scenario