CVE-2016-6406: Cisco Email Security Appliance Firmware

Critical severity, CVSS 9.8. EPSS: 3.6% chance of exploitation in the next 30 days.

Cisco IronPort AsyncOS 9.1.2-023, 9.1.2-028, 9.1.2-036, 9.7.2-046, 9.7.2-047, 9.7.2-054, 10.0.0-124, and 10.0.0-125 on Email Security Appliance (ESA) devices, when Enrollment Client before 1.0.2-065 is installed, allows remote attackers to obtain root access via a connection to the testing/debugging interface, aka Bug ID CSCvb26017.

Affected products

• Cisco Email Security Appliance Firmware: version 9.1.2-023 only; version 9.1.2-028 only; version 9.1.2-036 only; version 9.7.2-046 only; version 9.7.2-047 only; version 9.7.2-054 only; …

Published 2016-09-22. Last modified 2026-06-17.