CVE-2011-4006: Cisco 5500 Series Adaptive Security Appliance

High severity, CVSS 7.8. EPSS: 1.3% chance of exploitation in the next 30 days.

The ESMTP inspection feature on Cisco Adaptive Security Appliances (ASA) 5500 series devices with software 8.2 through 8.5 allows remote attackers to cause a denial of service (CPU consumption) via an unspecified closing sequence, aka Bug ID CSCtt32565.

Affected products

• Cisco 5500 Series Adaptive Security Appliance
• Cisco Adaptive Security Appliance Software: version 8.2(1) only; version 8.2(2) only; version 8.2(3) only; version 8.2(3.9) only; version 8.2(4) only; version 8.2(4.1) only; …

Published 2012-05-02. Last modified 2026-06-16.