CVE-2017-6663VulnerabilityPublished 03/03/2022Updated 10/24/2026

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

Affects Cisco IOS and IOS XE SoftwareSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/03/2022
KEV deadline: 03/24/2022
EPSS: 2.1% chance of exploitation in 30 days – higher than 81% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2017-6663 (opens in a new tab)

Description

CVE-2017-6663 is a denial-of-service vulnerability in the Autonomic Networking feature of Cisco IOS and IOS XE Software. An unauthenticated attacker adjacent to the network could exploit this flaw to cause affected autonomic nodes to reload, disrupting service availability. This vulnerability has been exploited in the wild.

Summary

This vulnerability affects the Autonomic Networking feature in Cisco IOS and IOS XE Software, allowing an unauthenticated, adjacent attacker to trigger a reload of autonomic nodes on the affected system. The result is a denial-of-service condition. The vulnerability has been observed to be exploited in real-world attacks.

Impact

Exploitation of this vulnerability results in denial-of-service by forcing affected autonomic nodes to reload, causing service disruption. The attacker does not require authentication but must be adjacent to the network.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, network administrators should monitor for exploitation attempts and consider network segmentation to limit adjacency exposure.

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 10:27:32 UTC

References

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