CVE-2012-4651: Cisco IOS

Medium severity, CVSS 4.3. EPSS: 1.1% chance of exploitation in the next 30 days.

Cisco IOS before 15.3(2)T, when scansafe is enabled, allows remote attackers to cause a denial of service (latency) via SYN packets that are not accompanied by SYN-ACK packets from the Scan Safe Tower, aka Bug ID CSCub85451.

Affected products

• Cisco IOS: up to and including 15.3\(3\)m2; version 15.3 only; version 15.3(2)s only; version 15.3(3)m only; version 15.3(3)m1 only; version 15.3(3)s only; …

Published 2014-04-23. Last modified 2026-06-16.