CVEvulnerability

CVE-2018-0159

7.5 HIGH Known exploited Published 2018-03-28 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability — Cisco IOS Software and Cisco IOS XE Software

Added to KEV: 2022-03-03
Remediation due: 2022-03-17
Ransomware use: Unknown
Required action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2018-0159

Status: Analyzed
Published: 2018-03-28
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected]): 7.8 HIGH — AV:N/AC:L/Au:N/C:N/I:N/A:C
Weaknesses: CWE-20

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.

Affected configurations

• cisco ios 15.3\(3\)s • cisco ios xe 15.3\(3\)s

Weakness · CWE (1)

CWE-20 Improper Input Validation weakness

References