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CVE-2017-12235

High 7.5 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET 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 the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS 12.2 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to the improper parsing of ingress PN-DCP Identify Request packets destined to an affected device. An attacker could exploit this vulnerability by sending a crafted PN-DCP Identify Request packet to an affected device and then continuing to send normal PN-DCP Identify Request packets to the device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. This vulnerability affects Cisco devices that are configured to process PROFINET messages. Beginning with Cisco IOS Software Release 12.2(52)SE, PROFINET is enabled by default on all the base switch module and expansion-unit Ethernet ports. Cisco Bug IDs: CSCuz47179.

Metrics

CVSS 3.1
7.5 (HIGH) Score source: NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — exploit probability
7% (percentile: 94) as of 1 November 2026
CWE
CWE-20

Affected products

cisco: ios; cisco: industrial ethernet 2000 16ptc-g-e switch; cisco: industrial ethernet 2000 16ptc-g-l switch; cisco: industrial ethernet 2000 16ptc-g-nx switch; cisco: industrial ethernet 2000 16t67-b switch; cisco: industrial ethernet 2000 16t67p-g-e switch; cisco: industrial ethernet 2000 16tc-g-e switch; cisco: industrial ethernet 2000 16tc-g-l switch; cisco: industrial ethernet 2000 16tc-g-n switch; cisco: industrial ethernet 2000 16tc-g-x switch; cisco: industrial ethernet 2000 16tc-l switch; cisco: industrial ethernet 2000 24t67-b switch; cisco: industrial ethernet 2000 4s-ts-g-b switch; cisco: industrial ethernet 2000 4s-ts-g-l switch; cisco: industrial ethernet 2000 4t-b switch

References