The ASN1 library in OpenSSL 0.9.6d and earlier, and 0.9.7-beta2 and earlier, allows remote attackers to cause a denial of service via invalid encodings.
http://www.securityfocus.com/bid/5366
http://www.kb.cert.org/vuls/id/748355
http://www.iss.net/security_center/static/9718.php
http://www.cert.org/advisories/CA-2002-23.html
http://rhn.redhat.com/errata/RHSA-2002-164.html
http://rhn.redhat.com/errata/RHSA-2002-161.html
http://rhn.redhat.com/errata/RHSA-2002-160.html
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000516