CVE-2018-0197

Cisco IOS and IOS XE Software VLAN Trunking Protocol Denial of Service Vulnerability

Description

A vulnerability in the VLAN Trunking Protocol (VTP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to corrupt the internal VTP database on an affected device and cause a denial of service (DoS) condition. The vulnerability is due to a logic error in how the affected software handles a subset of VTP packets. An attacker could exploit this vulnerability by sending VTP packets in a sequence that triggers a timeout in the VTP message processing code of the affected software. A successful exploit could allow the attacker to impact the ability to create, modify, or delete VLANs and cause a DoS condition. There are workarounds that address this vulnerability. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS Software or Cisco IOS XE Software, are operating in VTP client mode or VTP server mode, and do not have a VTP domain name configured. The default configuration for Cisco devices that are running Cisco IOS Software or Cisco IOS XE Software and support VTP is to operate in VTP server mode with no domain name configured.

Category

6.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.15%
Vendor Advisory cisco.com
Affected: Cisco Cisco IOS and IOS XE Software
Published at:
Updated at:

References

Link Tags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-vtp vendor advisory
http://www.securityfocus.com/bid/105424 third party advisory vdb entry

Frequently Asked Questions

What is the severity of CVE-2018-0197?
CVE-2018-0197 has been scored as a medium severity vulnerability.
How to fix CVE-2018-0197?
To fix CVE-2018-0197, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-0197 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-0197 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-0197?
CVE-2018-0197 affects Cisco Cisco IOS and IOS XE Software.
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