It was discovered that there was a potential resource exhaustion attack in
modsecurity-apache, an Apache module which inspects HTTP requests with the
aim of preventing typical web application attacks such as XSS and SQL.
For Debian 8 Jessie, these problems have been fixed in version 2.8.0-3+deb8u1.
We recommend that you upgrade your modsecurity-apache packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/