CVE-2016-6386: Cisco IOS XE

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

Cisco IOS XE 3.1 through 3.17 and 16.1 on 64-bit platforms allows remote attackers to cause a denial of service (data-structure corruption and device reload) via fragmented IPv4 packets, aka Bug ID CSCux66005.

Affected products

• Cisco IOS XE: version 3.1.0s only; version 3.1.0sg only; version 3.1.1s only; version 3.1.1sg only; version 3.1.2s only; version 3.1.3as only; …
• Cisco IOS XE 16.1: version 16.1.2 only
• Cisco IOS XE 3.2ja: version 3.2.0ja only
• Cisco IOS XE 3.3sg: version 3.3.0sg only; version 3.3.1sg only; version 3.3.2sg only
• Cisco IOS XE 3.3xo: version 3.3.0xo only; version 3.3.1xo only; version 3.3.2xo only
• Cisco IOS XE 3.4sg: version 3.4.0sg only; version 3.4.1sg only; version 3.4.2sg only; version 3.4.3sg only; version 3.4.4sg only; version 3.4.5sg only; …

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