CVE-2009-4921: Cisco ASA 5580

High severity, CVSS 7.8. EPSS: 1.2% chance of exploitation in the next 30 days.

Cisco Adaptive Security Appliances (ASA) 5580 series devices with software before 8.1(2) allow remote attackers to cause a denial of service (traceback) via malformed TCP packets, aka Bug ID CSCsm84110.

Affected products

• Cisco ASA 5580: up to and including 8.1\(1\)

Published 2010-06-29. Last modified 2026-06-16.