CVE-2018-0156

CVE-2018-0156

Vendor N/A

Product Cisco IOS and IOS XE

Weakness CWE-399

KEV Status Known Exploited

Published March 28, 2018

Last update January 12, 2026

View on NVD All CVEs

CVSS base score

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What the vulnerability does

01Description

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.

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

March 28, 2018 CVE published

January 12, 2026 Record updated

External resources

04References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2018-0156 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/399.html CISA KEV Reference https://nvd.nist.gov/vuln/detail/CVE-2018-0156

Related vulnerabilities

01Description

02CISA Required Action

03Disclosure timeline

04References

05Related CVE