CVE-2017-6663: Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability

Medium severity, CVSS 6.5. Actively exploited: in CISA KEV since 2022-03-03. EPSS: 2.1% chance of exploitation in the next 30 days.

A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. More Information: CSCvd88936. Known Affected Releases: Denali-16.2.1 Denali-16.3.1.

Affected products

• Cisco IOS: version 15.2(3)e only; version 15.2(3)e1 only; version 15.2(3)e2 only; version 15.2(3)e3 only; version 15.2(3)e4 only; version 15.2(3)e5 only; …
• Cisco IOS XE: version 3.7.0e only; version 3.7.1e only; version 3.7.3e only; version 3.8.0e only; version 3.8.0ex only; version 3.8.1e only; …

Published 2017-08-07. Last modified 2026-06-17.