CVE-2018-0159: Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability

Vulnerability summary

CVE-2018-0159 is a high (CVSS 7.8) Improper Input Validation vulnerability in Cisco IOS Software and Cisco IOS XE Software. It is known to be exploited: CISA lists it, first on 03-03-2022. EPSS estimates a 6.87% chance of exploitation in the next 30 days, higher than 93.9% of scored vulnerabilities.

Timeline

1. 28-03-2018
   PublishedVulnerability first disclosed.
2. 03-03-2022
   Added to CISA KEVCisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability
3. 17-03-2022
   CISA remediation dueApply updates per vendor instructions.
4. 12-01-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.