CVE-2016-6421: Cisco IOS XR

Medium severity, CVSS 5.3. EPSS: 1.6% chance of exploitation in the next 30 days.

Cisco IOS XR 5.2.2 allows remote attackers to cause a denial of service (process restart) via a crafted OSPF Link State Advertisement (LSA) update, aka Bug ID CSCvb05643.

Affected products

• Cisco IOS XR: version 5.2.2 only

Published 2016-10-05. Last modified 2026-06-17.