CVE-2018-15396: Cisco Unity Connection

Medium severity, CVSS 6.8. EPSS: 1.8% chance of exploitation in the next 30 days.

A vulnerability in the Bulk Administration Tool (BAT) for Cisco Unity Connection could allow an authenticated, remote attacker to cause high disk utilization, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software does not restrict the maximum size of certain files that can be written to disk. An attacker who has valid administrator credentials for an affected system could exploit this vulnerability by sending a crafted, remote connection request to an affected system. A successful exploit could allow the attacker to write a file that consumes most of the available disk space on the system, causing application functions to operate abnormally and leading to a DoS condition.

Affected products

• Cisco Unity Connection: version 12.5 only

Published 2018-10-05. Last modified 2026-06-17.