Versions mentioned in the description apply to the upstream
Remediation section below for
Debian:9 relevant versions.
The mod_dav_svn Apache HTTPD server module in Subversion 1.6.x before 1.6.21 and 1.7.0 through 1.7.8 allows remote authenticated users to cause a denial of service (memory consumption) by (1) setting or (2) deleting a large number of properties for a file or directory.
subversion to version 1.7.9-1 or higher.