CVS 1.12.x through 1.12.8, and 1.11.x through 1.11.16, does not properly handle malformed "Entry" lines, which prevents a NULL terminator from being used and may lead to a denial of service (crash), modification of critical program data, or arbitrary code execution.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A993
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10575
http://www.redhat.com/support/errata/RHSA-2004-233.html
http://www.mandriva.com/security/advisories?name=MDKSA-2004:058
http://www.debian.org/security/2004/dsa-517
http://security.gentoo.org/glsa/glsa-200406-06.xml
http://security.e-matters.de/advisories/092004.html
http://marc.info/?l=bugtraq&m=108716553923643&w=2
http://lists.grok.org.uk/pipermail/full-disclosure/2004-June/022441.html