CVE-2005-2531

Name	CVE-2005-2531
Description	OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush the OpenSSL error queue when a client fails certificate authentication to the server and causes the error to be processed by the wrong client, which allows remote attackers to cause a denial of service (client disconnection) via a large number of failed authentication attempts.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-851-1
Debian Bugs	324167

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openvpn (PTS)	jessie, jessie (lts)	2.3.4-5+deb8u3	fixed
	stretch (security), stretch (lts), stretch	2.4.0-6+deb9u4	fixed
	buster	2.4.7-1+deb10u1	fixed
	bullseye	2.5.1-3	fixed
	bookworm (security), bookworm	2.6.3-1+deb12u2	fixed
	sid, trixie	2.6.12-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
openvpn	source	sarge	2.0-1sarge1		DSA-851-1
openvpn	source	(unstable)	2.0.2-1	high		324167