CVE-2015-6289: Cisco IOS

High severity, CVSS 7.5. EPSS: 4.4% chance of exploitation in the next 30 days.

Cisco IOS 15.5(3)M on Integrated Services Router (ISR) 800, 819, and 829 devices allows remote attackers to cause a denial of service (memory consumption) via crafted TCP packets on the SSH port, aka Bug ID CSCuu13476.

Affected products

• Cisco IOS: version 15.5(3)m only

Published 2016-06-23. Last modified 2026-06-17.