The upnp_event_prepare function in upnpevents.c in MiniUPnP MiniUPnPd through 2.1 allows a remote attacker to leak information from the heap due to improper validation of an snprintf return value.

Affected: Ubuntu:16.04:LTS: miniupnpd

It was discovered that MiniUPnPd did not properly validate callback addresses. A remote attacker could possibly use this issue to expose sensitive information. (CVE-2019-12107)

It was discovered that MiniUPnPd incorrectly handled unpopulated user XML input. An attacker could possibly use this issue to cause MiniUPnPd to crash, resulting in a denial of service. (CVE-2019-12108, CVE-2019-12109)

It was discovered that MiniUPnPd incorrectly handled an empty description when port mapping. An attacker could possibly use this issue to cause MiniUPnPd to crash, resulting in a denial of service. (CVE-2019-12110)

It was discovered that MiniUPnPd did not properly parse certain PCP requests. An attacker could possibly use this issue to cause MiniUPnPd to crash, resulting in a denial of service. (CVE-2019-12111)