CVE-2018-0159

7.5 HIGH 7% exploit odds exploited in the wild Fix listed Denial of service Network gear

What it is

A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in 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 is due to improper validation of specific IKEv1 packets. An attacker could exploit this vulnerability by sending crafted IKEv1 packets to an affected device during an IKE negotiation. A successful exploit could allow the attacker to cause an affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuj73916.

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: 6.9% 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: 6.9% · EPSS, next 30 days
Weakness: CWE-20 · Improper input validation
Record status: Analyzed

Affected

Cisco iOS 15.3\(3\)s
Cisco iOS Xe 15.3\(3\)s

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-2018-0159.md and follow it. Check whether this project is affected by CVE-2018-0159. 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