CVE-2015-0610: Cisco IOS

Medium severity, CVSS 4.3. EPSS: 1.4% chance of exploitation in the next 30 days.

Race condition in the object-group ACL feature in Cisco IOS 15.5(2)T and earlier allows remote attackers to bypass intended access restrictions via crafted network traffic that triggers improper handling of the timing of process switching and Cisco Express Forwarding (CEF) switching, aka Bug ID CSCun21071.

Affected products

• Cisco IOS: up to and including 15.5\(2\)t; version 15.5(1)t only; version 15.5(1)t1 only; version 15.5t only

Published 2015-02-12. Last modified 2026-06-17.