CVE-2017-12235highunder attackCWE-20

CVE-2017-12235: high-severity vulnerability in Cisco IOS

Published · Updated

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51Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA.

ssvc Actcvss 7.5epss 7.1%
from disclosure to weapon
Published on NVDSep 28
CISA KEV+1617d
Action required by CISAfederal deadline: 2022-03-24

Apply updates per vendor instructions.

In short

A flaw in Cisco IOS devices allows an attacker to crash the device by sending specially crafted PROFINET messages, causing it to temporarily stop working. This affects network switches that have PROFINET enabled, making them vulnerable to denial-of-service attacks from the internet.

Technical detail

The vulnerability exists in improper parsing of PN-DCP Identify Request packets in Cisco IOS 12.2–15.6. An unauthenticated remote attacker can exploit this by sending a malformed PN-DCP packet followed by normal packets, triggering a device reload and denial of service. The attack requires the device to be configured to process PROFINET messages (enabled by default on switch modules).

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
n/a · Cisco IOS