Live › vulnerability › CVE-2018-0159
Go to dashboardA flaw in how Cisco IOS and IOS XE handle IKEv1 (Internet Key Exchange version 1) lets a remote attacker crash the device with crafted traffic. The attacker gets a denial of service: the router or switch reloads, but no code execution or data access is stated in the sources.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Cisco IOS Software and Cisco IOS XE Software | vendor | – | – |
Unknown from the sources.
Apply the Cisco IOS/IOS XE update per vendor instructions (CISA KEV required action); the fixed version is unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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