mod_rpaf is a reverse proxy add forward module for backend Apache servers.
An error has been found in the way mod_rpaf handles X-Forwarded-For headers. Please review the CVE identifier referenced below for details.
A remote attacker could send a specially crafted HTTP header, possibly resulting in a Denial of Service condition.
There is no known workaround at this time.
All mod_rpaf users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=www-apache/mod_rpaf-0.6"