CVE-2021-1406: Cisco Unified Communications Manager

Medium severity, CVSS 4.9. EPSS: 1.1% chance of exploitation in the next 30 days.

A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to access sensitive information on an affected device. The vulnerability is due to improper inclusion of sensitive information in downloadable files. An attacker could exploit this vulnerability by authenticating to an affected device and issuing a specific set of commands. A successful exploit could allow the attacker to obtain hashed credentials of system users. To exploit this vulnerability an attacker would need to have valid user credentials with elevated privileges.

Affected products

• Cisco Unified Communications Manager: version 10.5(2) only; version 10.5(2)su1 only; version 10.5(2)su2 only; version 10.5(2)su2a only; version 10.5(2)su3 only; version 10.5(2)su3a only; …

Published 2021-04-08. Last modified 2026-06-17.