Actively exploited · Published Sep 28, 2017 · Assigned by cisco
CVE-2017-12237
High 7.5 Exploited
In plain English
A high-severity security flaw in Cisco IOS and IOS XE. Attackers are actively exploiting it in the wild (listed by CISA on March 3, 2022). The chance it is exploited in the next 30 days is estimated at 7.1% (higher than 94% of all known vulnerabilities). Apply updates per vendor instructions.
CISA guidance
Apply updates per vendor instructions.
Federal agencies must remediate by Mar 24, 2022.
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | Cisco IOS and IOS XE | Cisco IOS and IOS XE |
Weakness: CWE-399 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-ike x_refsource_CONFIRM
- 1039460 vdb-entry, x_refsource_SECTRACK
- 101037 vdb-entry, x_refsource_BID
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12237 government-resource