Is CVE-2018-0156 actively exploited?

CVE-2018-0156 has no public evidence of in-the-wild exploitation as of 2026-01-12.

What is the CVSS score for CVE-2018-0156?

CVE-2018-0156 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2018-0156?

Patch guidance is available from cisco security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2018-0156.

Fix CVE-2018-0156 - HIGH cisco ios

Q: Which products are affected by CVE-2018-0156?

4 products: cisco ios, cisco ios, cisco ios xe, cisco ios xe.

Description

A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted packet to an affected device on TCP port 4786. Only Smart Install client switches are affected. Cisco devices that are configured as a Smart Install director are not affected by this vulnerability. Cisco Bug IDs: CSCvd40673.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-399 CWE-20 · Improper Input Validation

Metadata

Primary Vendor: CISCO
Published: 3/28/2018
Last Modified: 1/12/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2018-0156

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary