CVE-2017-12234highunder attackCWE-20

CVE-2017-12234: 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

Cisco IOS devices running versions 12.4 to 15.6 can crash when they receive specially crafted network packets using the Common Industrial Protocol (CIP). An attacker can remotely send these malicious packets to knock the device offline without needing to log in.

Technical detail

The vulnerability exists in improper parsing of CIP packets in Cisco IOS 12.4-15.6, allowing unauthenticated remote attackers to trigger a denial of service by crafting CIP packets that cause device reload. The attack vector is network-based with no authentication or user interaction required; successful exploitation results in loss of availability.

Summary generated and translated by AI from the official description.

The full analysis of this CVE is available in Portuguese →

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 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 vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted CIP packets to be processed by 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: CSCvc43709.
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