CVE-2013-3386: Cisco Ironport Asyncos

High severity, CVSS 7.8. EPSS: 1.9% chance of exploitation in the next 30 days.

The IronPort Spam Quarantine (ISQ) component in the web framework in IronPort AsyncOS on Cisco Email Security Appliance devices before 7.1.5-106 and 7.3, 7.5, and 7.6 before 7.6.3-019 and Content Security Management Appliance devices before 7.9.1-102 and 8.0 before 8.0.0-404 allows remote attackers to cause a denial of service (service crash or hang) via a high rate of TCP connection attempts, aka Bug IDs CSCzv25573 and CSCzv81712.

Affected products

• Cisco Ironport Asyncos: up to and including 7.1.5; version 7.3 only; version 7.5 only; version 7.6 only; version 7.9 only; version 8.0 only

Published 2013-06-27. Last modified 2026-06-16.