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CVE-2017-12232

Medium 6.5 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply updates per vendor instructions.

Description

A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS 15.0 through 15.6 could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a misclassification of Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvc03809.

Metrics

CVSS 3.1
6.5 (MEDIUM) Score source: NVD CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — exploit probability
2% (percentile: 82) as of 1 November 2026
CWE
CWE-399

Affected products

cisco: ios; cisco: 1000 integrated services router; cisco: 1100-4g\/6g integrated services router; cisco: 1100-4g integrated services router; cisco: 1100-4gltegb integrated services router; cisco: 1100-4gltena integrated services router; cisco: 1100-8p integrated services router; cisco: 1100-lte integrated services router; cisco: 1100 integrated services router; cisco: 1101-4p integrated services router; cisco: 1101 integrated services router; cisco: 1109-2p integrated services router; cisco: 1109-4p integrated services router; cisco: 1109 integrated services router; cisco: 1111x-8p integrated services router

References