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, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, 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)	bullseye	2.5.1-3	fixed
	bullseye (security)	2.5.1-3+deb11u2	fixed
	bookworm	2.6.3-1+deb12u3	fixed
	bookworm (security)	2.6.3-1+deb12u2	fixed
	trixie	2.6.14-1	fixed
	forky, sid	2.6.15-1	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