A buffer overflow has been found in Dovecot mail server which is used on most ISPConfig systems. Debian and Ubuntu released patched dovecot versions for their current releases already, please take care to update your servers in a timely manner with: apt-get update apt-get upgrade Update State of Dovecot Packages for Debian: https://security-tracker.debian.org/tracker/source-package/dovecot Dovecot security advisory: https://www.openwall.com/lists/oss-security/2019/08/28/3