A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS 15.0 through 15.6 and Cisco IOS XE 3.5 through 16.5 could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads to a denial of service (DoS) condition. The vulnerability is due to how an affected device processes certain IKEv2 packets. An attacker could exploit this vulnerability by sending specific IKEv2 packets to an affected device to be processed. A successful exploit could allow the attacker to cause high CPU utilization, traceback messages, or a reload of the affected device that leads to a DoS condition. This vulnerability affects Cisco devices that have the Internet Security Association and Key Management Protocol (ISAKMP) enabled. Although only IKEv2 packets can be used to trigger this vulnerability, devices that are running Cisco IOS Software or Cisco IOS XE Software are vulnerable when ISAKMP is enabled. A device does not need to be configured with any IKEv2-specific features to be vulnerable. Many features use IKEv2, including different types of VPNs such as the following: LAN-to-LAN VPN; Remote-access VPN, excluding SSL VPN; Dynamic Multipoint VPN (DMVPN); and FlexVPN. Cisco Bug IDs: CSCvc41277.
Published 2017-09-29 01:34:49
Updated 2025-01-27 19:01:06
View at NVD,   CVE.org
Vulnerability category: Denial of service

Products affected by CVE-2017-12237

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CVE-2017-12237 is in the CISA Known Exploited Vulnerabilities Catalog

CISA vulnerability name:
Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS and Cisco IOS XE could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads to a denial of service.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2017-12237
Added on 2022-03-03 Action due date 2022-03-24

Exploit prediction scoring system (EPSS) score for CVE-2017-12237

8.58%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 92 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2017-12237

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.8
HIGH AV:N/AC:L/Au:N/C:N/I:N/A:C
10.0
6.9
NIST
7.5
HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
NIST 2024-07-16

CWE ids for CVE-2017-12237

  • Assigned by:
    • psirt@cisco.com (Secondary)
    • ykramarz@cisco.com (Secondary)
  • The product does not properly control the allocation and maintenance of a limited resource.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2017-12237

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