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CVE Record

CVE-2018-0197: Cisco IOS and IOS XE Software VLAN Trunking Protocol Denial of Service Vulnerability

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This Cisco IOS/IOS XE issue can disrupt VLAN administration on affected network devices. A nearby network attacker can trigger corruption of the internal VTP database, leading to a denial-of-service condition. The risk is operational rather than data theft, but it can affect network change management and availability. Exposure is limited to Cisco IOS/IOS XE devices on vulnerable releases, operating in VTP client or server mode, with no VTP domain name configured. The source notes this is the default for Cisco devices that support VTP. Treat this as a network availability and operations risk. It is most urgent for sites where VLAN changes support production, segmentation, or recovery operations. Adjacent-only attack requirements reduce broad exposure, but default VTP settings may increase internal exposure. Mitigation focus: Review Cisco advisory cisco-sa-20180926-vtp for fixed releases and documented workarounds.; Prioritize devices running IOS or IOS XE with VTP enabled in client or server mode.; Address unset VTP domain-name exposure where Cisco guidance and network design allow..

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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2Source links

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Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
CiscoCisco IOS and IOS XE Software15.2(2)E6Listed
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