CVE-2021-1267: Cisco Secure Firewall Management Center

Medium severity, CVSS 4.3. EPSS: 1% chance of exploitation in the next 30 days.

A vulnerability in the dashboard widget of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper restrictions on XML entities. An attacker could exploit this vulnerability by crafting an XML-based widget on an affected server. A successful exploit could cause increased memory and CPU utilization, which could result in a DoS condition.

Affected products

• Cisco Secure Firewall Management Center: before 6.6.1 (fixed in 6.6.1)

Published 2021-01-13. Last modified 2026-06-17.