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CVE-2018-0172

8.6
HIGHCVSS v3.1 Base Score
6.19%
LOW RiskEPSS (91st percentile)
KEV

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.

Published: 3/28/2018
Modified: 1/14/2026
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Cisco IOS and IOS XE Software Improper Input Validation Vulnerability

Vendor / Product:

Cisco IOS and IOS XE Software

Required Action:

Apply updates per vendor instructions.

Due Date: 3/17/2022(OVERDUE)
Added to KEV:

3/3/2022

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2018-0172

Vulnerability Summary

CVSS v3 Score

8.6HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v2 Score

7.8

AV:N/AC:L/Au:N/C:N/I:N/A:C

EPSS Score (Exploitation Probability)

6.19%LOW Exploitation Risk
91st percentile

This vulnerability has a 6.19% probability of being exploited in the next 30 days, ranking higher than 91% of all scored CVEs.

CWE Classification

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Same Weakness Type(CWE-20)

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Similar SeverityHIGH