CVE-2015-6377: Cisco Virtual Topology System

High severity, CVSS 7.8. EPSS: 1.9% chance of exploitation in the next 30 days.

Cisco Virtual Topology System (VTS) 2.0(0) and 2.0(1) allows remote attackers to cause a denial of service (CPU and memory consumption, and TCP port outage) via a flood of crafted TCP packets, aka Bug ID CSCux13379.

Affected products

• Cisco Virtual Topology System: version 2.0(0) only; version 2.0(1) only

Published 2015-11-24. Last modified 2026-06-17.