CVE-2015-4191: Cisco IOS XR

Medium severity, CVSS 5.0. EPSS: 2.9% chance of exploitation in the next 30 days.

Cisco IOS XR 5.2.1 allows remote attackers to cause a denial of service (ipv6_io service reload) via a malformed IPv6 packet, aka Bug ID CSCuq95565.

Affected products

• Cisco IOS XR: version 5.2.1 only

Published 2015-06-19. Last modified 2026-06-17.