CVE-2018-0197
Cisco IOS and IOS XE Software VLAN Trunking Protocol Denial of Service Vulnerability
MEDIUM
6.5
CVSS Score
Published: October 5, 2018 at 02:00 PM UTC
Updated: June 17, 2026 at 01:30 AM UTC
2 products affected across 1 vendorIOSIOS Xe
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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
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15.2(2)E616.1.116.1.216.1.316.2.116.2.216.3.116.3.1a16.3.216.3.316.3.416.3.516.3.5b16.4.116.4.216.5.116.5.1a16.5.1b16.5.216.6.116.6.216.7.13.10.4s3.12.0as3.15.0s3.15.1cs3.15.1s3.15.2s3.15.3s3.15.4s3.16.0bs3.16.0cs3.16.0s3.16.1as3.16.1s3.16.2s3.16.3s3.16.4as3.16.4bs3.16.4cs3.16.4ds3.16.4es3.16.4gs3.16.5as3.16.5bs3.16.5s3.16.6bs3.16.6s3.17.0s3.17.1s3.17.3s3.17.4s3.2.0ja3.2.0se3.2.0sg3.2.10sg3.2.11sg3.2.1se3.2.1sg3.2.2se3.2.2sg3.2.3se3.2.3sg3.2.4sg3.2.5sg3.2.6sg3.2.7sg3.2.8sg3.2.9sg3.3.0se3.3.0sg3.3.0sq3.3.0xo3.3.1se3.3.1sg3.3.1sq3.3.1xo3.3.2se3.3.2sg3.3.2xo3.3.3se3.3.4se3.3.5se3.4.0sg3.4.0sq3.4.1sg3.4.1sq3.4.2sg3.4.3sg3.4.4sg3.4.5sg3.4.6sg3.4.7sg3.4.8sg3.5.0e3.5.0sq3.5.1e3.5.1sq3.5.2e3.5.2sq3.5.3e3.5.3sq3.5.4sq3.5.5sq3.5.6sq3.5.7sq3.6.0ae3.6.0be3.6.0e3.6.1e3.6.2ae3.6.2e3.6.3e3.6.4e3.6.5ae3.6.5be3.6.5e3.6.6e3.7.0e3.7.1e3.7.2e3.7.3e3.7.4e3.7.5e3.8.0e3.8.1e3.8.2e3.8.3e3.8.4e3.8.5ae3.8.5e3.9.0e3.9.1e3.9.2be3.9.2e
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
VDB Entryx_refsource_BIDThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/105424Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-vtpSSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- ADJACENT_NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusANALYZED
CWE
CWE-20
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