CVEvulnerability

CVE-2018-0174

8.6 HIGH Known exploited Published 2018-03-28 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability — Cisco IOS XE Software

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow for denial-of-service (DoS).

Added to KEV
2022-03-03
Remediation due
2022-03-17
Ransomware use
Unknown
Required action
Apply updates per vendor instructions.
Notes
https://nvd.nist.gov/vuln/detail/CVE-2018-0174
Status
Analyzed
Published
2018-03-28
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.6 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
8.6 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS 2.0 ([email protected])
7.8 HIGH — AV:N/AC:L/Au:N/C:N/I:N/A:C
Weaknesses
CWE-20

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 the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuh91645.

Affected configurations

• cisco ios 12.2\(33\)sre7a • cisco ios xe 12.2\(33\)sre7a • cisco ios (<= 15.2\(4a\)ea5) • cisco ios xe (<= 15.2\(4a\)ea5) • cisco ios (<= 15.2\(6\)e0a) • cisco ios xe (<= 15.2\(6\)e0a)

Related

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References