The currdcreatefile function (src/utilsrrdcreate.c) in collectd 4.x before 4.9.4 and before 4.10.2 allow remote attackers to cause a denial of service (assertion failure) via a packet with a timestamp whose value is 10 or less, as demonstrated by creating RRD files using the (1) RRDtool and (2) RRDCacheD plugins.

Heap-based buffer overflow in the parsepacket function in network.c in collectd before 5.4.3 and 5.x before 5.5.2 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via a crafted network packet.

The Gentoo app-admin/collectd package before 5.7.2-r1 sets the ownership of PID file directory to the collectd account, which might allow local users to kill arbitrary processes by leveraging access to this account for PID file modification before a root script sends a SIGKILL (when the service is stopped).

Incorrect interaction of the parsepacket() and parsepartsignsha256() functions in network.c in collectd allows remote attackers to cause a denial of service (infinite loop) of a collectd instance (configured with "SecurityLevel None" and with empty "AuthFile" options) via a crafted UDP packet.

Upstream bug:

https://github.com/collectd/collectd/issues/2174