CVE-2016-6399: Cisco Ace 4700 Series Application Control Engine Appliance

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

Cisco ACE30 Application Control Engine Module through A5 3.3 and ACE 4700 Application Control Engine appliances through A5 3.3 allow remote attackers to cause a denial of service (device reload) via crafted (1) SSL or (2) TLS packets, aka Bug ID CSCvb16317.

Affected products

• Cisco Ace 4700 Series Application Control Engine Appliance: version a5(1.0) only; version a5(1.1) only; version a5(1.2) only; version a5(2.0) only; version a5(2.1) only; version a5(2.1e) only; …
• Cisco Ace 4700 Series Application Control Engine Appliance a1: version 7 only; version 7a only; version 7b only; version 8.0 only; version 8.0a only
• Cisco Ace 4700 Series Application Control Engine Appliance a3: version 1.0 only; version 2.0 only; version 2.2 only; version 2.3 only; version 2.4 only; version 2.5 only; …
• Cisco Ace 4700 Series Application Control Engine Appliance a4: version 1.0 only; version 1.1 only; version 2.0 only; version 2.1a only; version 2.2 only; version 2.3 only
• Cisco Ace 4700 Series Application Control Engine Appliance a5: version 3.1a only; version 3.1b only; version 3.2 only; version 3.3 only
• Cisco Ace Application Control Engine Module a1: version 7a only; version 7b only; version 8.0 only; version 8.0a only
• Cisco Ace Application Control Engine Module a3: version 1.0 only; version 2.0 only; version 2.2 only; version 2.3 only; version 2.4 only; version 2.5 only; …
• Cisco Ace Application Control Engine Module a4: version 1.0 only; version 1.1 only; version 2.0 only; version 2.1a only; version 2.2 only; version 2.3 only
• Cisco Ace Application Control Engine Module a5: version 1.0 only; version 1.1 only; version 1.2 only; version 2.0 only; version 2.1 only; version 2.1e only; …

Published 2016-09-12. Last modified 2026-06-17.