CVE-2018-0156

7.5 HIGH 9% exploit odds exploited in the wild Fix listed Denial of service Network gear

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2017-11-27 00:00 UTC ReservedThe CVE id was reserved by its CNA
2018-03-28 22:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2022-03-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2022-03-17 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 01:29 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 9.4% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2018-03-28 22:29 UTC
Last modified: 2026-06-17 01:29 UTC
Added to CISA KEV: 2022-03-03
Exploit probability: 9.4% · EPSS, next 30 days
Weakness: CWE-399
Record status: Analyzed

Affected

Cisco iOS 15.2\(2\)e4
Cisco iOS 15.2\(2a\)ja
Cisco iOS Xe 15.2\(2\)e4
Cisco iOS Xe 15.2\(2a\)ja

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2018-0156.md and follow it. Check whether this project is affected by CVE-2018-0156. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record