CVE-2018-0410: Cisco Web Security Appliance

High severity, CVSS 8.6. EPSS: 4.1% chance of exploitation in the next 30 days.

A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliances could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected system. The vulnerability exists because the affected software improperly manages memory resources for TCP connections to a targeted device. An attacker could exploit this vulnerability by establishing a high number of TCP connections to the data interface of an affected device via IPv4 or IPv6. A successful exploit could allow the attacker to exhaust system memory, which could cause the system to stop processing new connections and result in a DoS condition. System recovery may require manual intervention. Cisco Bug IDs: CSCvf36610.

Affected products

• Cisco Web Security Appliance: version 9.1.1-074 only; version 9.1.2-010 only; version 9.1.2-022 only; version 9.1.2-039 only; version 10.1.0-204 only; version 10.1.1-235 only; …

Published 2018-08-15. Last modified 2026-06-17.