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CVE-2018-0172

High 8.6 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply updates per vendor instructions.

Description

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition. Cisco Bug IDs: CSCvg62730.

Metrics

CVSS 3.1
8.6 (HIGH) Score source: NVD CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS — exploit probability
8% (percentile: 95) as of 1 November 2026
CWE
CWE-20, CWE-787

Affected products

cisco: ios; cisco: ios xe; rockwellautomation: allen-bradley armorstratix 5700; rockwellautomation: allen-bradley stratix 5400; rockwellautomation: allen-bradley stratix 5410; rockwellautomation: allen-bradley stratix 5700; rockwellautomation: allen-bradley stratix 8000; rockwellautomation: allen-bradley stratix 8300

References